RAM PC Memory (248 products)

If you're looking for new RAM, take a look at the wide range of memory we have available. With sizes and speeds available to suit every need and budget, you can be sure to find RAM to improve your build and ensure applications run quickly and smoothly.

Read more about RAM PC Memory

Showing 1 - 24 of 248 results
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Patriot Viper Steel 16GB (2x 8GB) 3200MHz DDR4

  • 2 x 8GB DIMM Dual Channel Kit
  • Latency Timing: CL16
  • Speed: 3200MHz (PC4-25600)
  • Intel XMP Profile Support
  • non-ECC Unbuffered Memory

£ 54.58  inc. vat

£ 45.48 ex. vat

More Info

Corsair Vengeance RGB PRO Black 16GB 3600MHz AMD Ryzen Tuned DDR4 Memory Kit

  • 16GB (1x16GB) DDR4
  • 3600Mhz
  • Ryzen Tuned
  • Dynamic Multi-Zone RGB Lighting

£ 62.99  inc. vat

£68.99save £6.00

£ 52.49 ex. vat

£57.49save £5.00
More Info

Crucial 8GB (1x 8GB) 3200MHz DDR4 RAM

  • Capacity: 8GB (1x8GB)
  • Speed: 3200MHz
  • Latency Timing: CL22
  • Form Factor: DDR4 UDIMM
  • Warranty: Limited Lifetime

£ 23.99  inc. vat

£32.49save £8.50

£ 19.99 ex. vat

£27.07save £7.08
More Info

Crucial RAM CT8G4DFRA266 8GB DDR4 2666 MHz CL19 Desktop Memory

  • Capacity: 8GB (1x8GB)
  • Speed: 2666MHz
  • Latency Timing: CL19
  • Form Factor: DDR4 UDIMM
  • Warranty: Limited Lifetime

£ 25.98  inc. vat

£30.48save £4.50

£ 21.65 ex. vat

£25.40save £3.75
More Info

Patriot Memory Viper Steel 8GB DDR4 3200MHz Performance Memory Module

  • Capacity: 8GB (1x8GB)
  • Speed: 3200MHz
  • Latency Timing: CL16
  • Form Factor: DDR4 UDIMM
  • Warranty: Limited Lifetime

£ 25.64  inc. vat

£ 21.36 ex. vat

More Info

Crucial CT4G4DFS8266 4GB DDR4 2666 UDIMM

  • Capacity: 4GB (1x4GB)
  • Speed: 2666MHz
  • Latency Timing: CL19
  • Form Factor: DDR4 UDIMM
  • Warranty: Limited Lifetime

£ 15.99  inc. vat

£18.99save £3.00

£ 13.32 ex. vat

£15.82save £2.50
More Info

Corsair Vengeance LPX Black 32GB (2x16GB) 3600 MHz AMD Ryzen Tuned DDR4 Memory Dual Kit

  • 32GB (2x16GB)
  • PC4-28800 (3600)
  • Non-ECC Unbuff
  • CAS 18 1.35V
  • AMD Ryzen Optimised

£ 119.99  inc. vat

£126.82save £6.83

£ 99.99 ex. vat

£105.68save £5.69

0% Interest offers available

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Corsair Vengeance LPX Black 32GB 3600MHz 2x16GB DDR4 Memory Kit

  • 32GB (2x16GB)
  • PC4-28800 (3600)
  • Non-ECC Unbuffered
  • CAS 18-22-22-42
  • 1.35V

£ 136.13  inc. vat

£ 113.44 ex. vat

0% Interest offers available

More Info
Free Next Day Delivery* KLEVV BOLT X 32GB (16GB x 2) 3200MHz Powerful & Enhanced Desktop Gaming DRAM

KLEVV BOLT X 32GB (16GB x 2) 3200MHz Powerful & Enhanced Desktop Gaming DRAM

  • Capacity: 32GB (2x16GB)
  • Speed: 3200MHz
  • Latency Timing: CL16
  • Warranty: Limited Lifetime
  • 2x Individual Packaged 16GB Sticks

£ 84.99  inc. vat

£104.99save £20.00

£ 70.82 ex. vat

£87.49save £16.67
More Info

Crucial 16GB (1x 16GB) 3200MHz DDR4 RAM

  • Capacity: 16GB (1x16GB)
  • Speed: 3200MHz
  • Latency Timing: CL22
  • Form Factor: DDR4 UDIMM
  • Warranty: Limited Lifetime

£ 47.99  inc. vat

£59.99save £12.00

£ 39.99 ex. vat

£49.99save £10.00
More Info

Kingston FURY Beast 32GB (2 x 16GB) 3200MHz DDR4 RAM - Black

  • Capacity: 32GB (2x16GB)
  • Speed: 3200MHz
  • Latency Timing: CL16
  • Form Factor: DDR4 UDIMM
  • Warranty: Limited Lifetime

£ 112.49  inc. vat

£129.99save £17.50

£ 93.74 ex. vat

£108.32save £14.58

0% Interest offers available

More Info

Crucial CT16G4DFRA266 16GB (DDR4, 2666 MT/s, PC4-21300, DIMM, 288-Pin) Memory

  • Capacity: 16GB (1x16GB)
  • Speed: 2666MHz
  • Latency Timing: CL19
  • Form Factor: DDR4 UDIMM
  • Warranty: Limited Lifetime

£ 49.98  inc. vat

£57.99save £8.01

£ 41.65 ex. vat

£48.32save £6.67
More Info

Corsair Vengeance RGB Black PRO 16GB (2 x 8GB) DDR4 3200MHz

  • Capacity: 16GB (2x8GB)
  • Speed: 3200MHz
  • Latency Timing: CL16
  • Form Factor: DDR4 UDIMM
  • Warranty: Limited Lifetime

£ 68.99  inc. vat

£79.49save £10.50

£ 57.49 ex. vat

£66.24save £8.75
More Info

CORSAIR VENGEANCE DDR5 32GB (2x16GB) DDR5 5600 (PC5-44800) C36 1.25V - Black

  • 32GB (2 x 16GB)
  • 5600Mhz DDR5
  • Tested Latency 36-36-36-76
  • Voltage 1.25V

£ 191.55  inc. vat

£279.99save £88.44

£ 159.62 ex. vat

£233.32save £73.70

0% Interest offers available

More Info

Corsair Vengeance RGB Pro SL 32GB (2x16GB) 3600MHZ DDR4 RAM - Optimized for AMD Ryzen

  • Voltage: 1.35v
  • Latency Timing CL18
  • Speed: 3600Mhz
  • (PC4-28800)
  • 2 x 16GB DIMM Memory

£ 113.99  inc. vat

£137.99save £24.00

£ 94.99 ex. vat

£114.99save £20.00

0% Interest offers available

More Info

Kingston FURY Beast 16GB (2x 8GB) 6000MHz DDR5 RAM - Black

  • Memory Size: 16GB
  • Latency Timing: CL40
  • Speed: 6000MHz
  • 2 x 8GB DIMM Memory

£ 129.48  inc. vat

£141.99save £12.51

£ 107.90 ex. vat

£118.32save £10.42

0% Interest offers available

More Info

Corsair Value Select 8GB DDR4 2400MHz RAM/Memory Module

  • Capacity: 8GB (1x8GB)
  • Speed: 2400MHz
  • Latency Timing: CL16
  • Form Factor: DDR4 UDIMM
  • Warranty: Limited Lifetime

£ 26.99  inc. vat

£28.98save £1.99

£ 22.49 ex. vat

£24.15save £1.66
More Info

Kingston FURY Beast 32GB (16GB x 2) 5200MHz DDR5 CL38 DIMM Memory - Black

  • 32GB (16GB x 2)
  • 5200Mhz DDR5
  • Improved stability for overclocking
  • Increased efficiency
  • Intel® XMP 3.0-Ready and Certified

£ 154.98  inc. vat

£233.50save £78.52

£ 129.15 ex. vat

£194.58save £65.43

0% Interest offers available

More Info

Kingston FURY Beast 16GB (2 x 8GB) 3200MHz DDR4 RAM - Black

  • Capacity: 16GB (2x8GB)
  • Speed: 3200MHz
  • Latency Timing: CL16
  • Form Factor: DDR4 UDIMM
  • Warranty: Limited Lifetime

£ 63.57  inc. vat

£ 52.97 ex. vat

More Info

Corsair Vengeance RGB PRO Black 16GB 3600 MHz DDR4 Dual Channel Memory Kit

  • Capacity: 16GB (2x8GB)
  • Speed: 3600MHz
  • Latency Timing: CL18
  • Form Factor: DDR4 UDIMM
  • Warranty: Limited Lifetime

£ 72.99  inc. vat

£80.84save £7.85

£ 60.82 ex. vat

£67.36save £6.54
More Info

KLEVV 32GB (2X16GB) BOLT X DDR4 3600MHZ

  • Capacity: 32GB (2x16GB)
  • Speed: 3600MHz
  • Latency Timing: CL18
  • Form Factor: DDR4 UDIMM
  • Warranty: Limited Lifetime

£ 102.99  inc. vat

£ 85.82 ex. vat

0% Interest offers available

More Info

KLEVV 16GB Kit (2X8GB) CRAS X RGB GAMING DDR4 3600MHZ PC4-28800 1.35V CL18

  • Capacity: 16GB (2x8GB)
  • Speed: 3600MHz
  • Latency Timing: CL18
  • Form Factor: DDR4 UDIMM
  • Warranty: Limited Lifetime

£ 62.99  inc. vat

£67.98save £4.99

£ 52.49 ex. vat

£56.65save £4.16
More Info

G.SKILL TridentZ RGB Series 32GB (2 x 16GB) DDR4 3200Mhz DIMM CAS 16

  • Capacity: 32GB (2x16GB)
  • Speed: 3200MHz
  • Latency Timing: CL16
  • Form Factor: DDR4 UDIMM
  • Warranty: Limited Lifetime

£ 133.70  inc. vat

£ 111.41 ex. vat

0% Interest offers available

More Info

CORSAIR VENGEANCE RGB PRO 32GB (2x16GB) DDR4 3600 (PC4-28800)

  • 32GB (16GB x 2)
  • 3600Mhz DDR4
  • Dynamic Multi-Zone RGB Lighting
  • Compatible with iCue Software

£ 116.99  inc. vat

£133.49save £16.50

£ 97.49 ex. vat

£111.24save £13.75

0% Interest offers available

More Info

Patriot Viper Steel 16GB (2x 8GB) 3200MHz DDR4

  • 2 x 8GB DIMM Dual Channel Kit
  • Latency Timing: CL16
  • Speed: 3200MHz (PC4-25600)
  • Intel XMP Profile Support
  • non-ECC Unbuffered Memory

QuickFind: 1262569

Mfr part code: PVS416G320C6K

£ 54.58  inc. vat

£ 45.48 ex. vat

More Info

Corsair Vengeance RGB PRO Black 16GB 3600MHz AMD Ryzen Tuned DDR4 Memory Kit

  • 16GB (1x16GB) DDR4
  • 3600Mhz
  • Ryzen Tuned
  • Dynamic Multi-Zone RGB Lighting

QuickFind: 1128599

Mfr part code: CMW16GX4M1Z3600C18

£ 62.99  inc. vat

£68.99save £6.00

£ 52.49 ex. vat

£57.49save £5.00
More Info

Crucial 8GB (1x 8GB) 3200MHz DDR4 RAM

  • Capacity: 8GB (1x8GB)
  • Speed: 3200MHz
  • Latency Timing: CL22
  • Form Factor: DDR4 UDIMM
  • Warranty: Limited Lifetime

QuickFind: 1289037

Mfr part code: CT8G4DFRA32A

£ 23.99  inc. vat

£32.49save £8.50

£ 19.99 ex. vat

£27.07save £7.08
More Info

Crucial RAM CT8G4DFRA266 8GB DDR4 2666 MHz CL19 Desktop Memory

  • Capacity: 8GB (1x8GB)
  • Speed: 2666MHz
  • Latency Timing: CL19
  • Form Factor: DDR4 UDIMM
  • Warranty: Limited Lifetime

QuickFind: 1128689

Mfr part code: CT8G4DFRA266

£ 25.98  inc. vat

£30.48save £4.50

£ 21.65 ex. vat

£25.40save £3.75
More Info

Patriot Memory Viper Steel 8GB DDR4 3200MHz Performance Memory Module

  • Capacity: 8GB (1x8GB)
  • Speed: 3200MHz
  • Latency Timing: CL16
  • Form Factor: DDR4 UDIMM
  • Warranty: Limited Lifetime

QuickFind: 900767

Mfr part code: PVS48G320C6

£ 25.64  inc. vat

£ 21.36 ex. vat

More Info

Crucial CT4G4DFS8266 4GB DDR4 2666 UDIMM

  • Capacity: 4GB (1x4GB)
  • Speed: 2666MHz
  • Latency Timing: CL19
  • Form Factor: DDR4 UDIMM
  • Warranty: Limited Lifetime

QuickFind: 882333

Mfr part code: CT4G4DFS8266

£ 15.99  inc. vat

£18.99save £3.00

£ 13.32 ex. vat

£15.82save £2.50
More Info

Corsair Vengeance LPX Black 32GB (2x16GB) 3600 MHz AMD Ryzen Tuned DDR4 Memory Dual Kit

  • 32GB (2x16GB)
  • PC4-28800 (3600)
  • Non-ECC Unbuff
  • CAS 18 1.35V
  • AMD Ryzen Optimised

QuickFind: 982371

Mfr part code: CMK32GX4M2Z3600C18

£ 119.99  inc. vat

£126.82save £6.83

£ 99.99 ex. vat

£105.68save £5.69

0% Interest offers available

More Info

Corsair Vengeance LPX Black 32GB 3600MHz 2x16GB DDR4 Memory Kit

  • 32GB (2x16GB)
  • PC4-28800 (3600)
  • Non-ECC Unbuffered
  • CAS 18-22-22-42
  • 1.35V

QuickFind: 957347

Mfr part code: CMK32GX4M2D3600C18

£ 136.13  inc. vat

£ 113.44 ex. vat

0% Interest offers available

More Info
Free Next Day Delivery*

KLEVV BOLT X 32GB (16GB x 2) 3200MHz Powerful & Enhanced Desktop Gaming DRAM

  • Capacity: 32GB (2x16GB)
  • Speed: 3200MHz
  • Latency Timing: CL16
  • Warranty: Limited Lifetime
  • 2x Individual Packaged 16GB Sticks

QuickFind: 1537611

Mfr part code: KD4AGU880-32A160TK2

£ 84.99  inc. vat

£104.99save £20.00

£ 70.82 ex. vat

£87.49save £16.67
More Info

Crucial 16GB (1x 16GB) 3200MHz DDR4 RAM

  • Capacity: 16GB (1x16GB)
  • Speed: 3200MHz
  • Latency Timing: CL22
  • Form Factor: DDR4 UDIMM
  • Warranty: Limited Lifetime

QuickFind: 1265344

Mfr part code: CT16G4DFRA32A

£ 47.99  inc. vat

£59.99save £12.00

£ 39.99 ex. vat

£49.99save £10.00
More Info

Kingston FURY Beast 32GB (2 x 16GB) 3200MHz DDR4 RAM - Black

  • Capacity: 32GB (2x16GB)
  • Speed: 3200MHz
  • Latency Timing: CL16
  • Form Factor: DDR4 UDIMM
  • Warranty: Limited Lifetime

QuickFind: 1286156

Mfr part code: KF432C16BBK2/32

£ 112.49  inc. vat

£129.99save £17.50

£ 93.74 ex. vat

£108.32save £14.58

0% Interest offers available

More Info

Crucial CT16G4DFRA266 16GB (DDR4, 2666 MT/s, PC4-21300, DIMM, 288-Pin) Memory

  • Capacity: 16GB (1x16GB)
  • Speed: 2666MHz
  • Latency Timing: CL19
  • Form Factor: DDR4 UDIMM
  • Warranty: Limited Lifetime

QuickFind: 1128219

Mfr part code: CT16G4DFRA266

£ 49.98  inc. vat

£57.99save £8.01

£ 41.65 ex. vat

£48.32save £6.67
More Info

Corsair Vengeance RGB Black PRO 16GB (2 x 8GB) DDR4 3200MHz

  • Capacity: 16GB (2x8GB)
  • Speed: 3200MHz
  • Latency Timing: CL16
  • Form Factor: DDR4 UDIMM
  • Warranty: Limited Lifetime

QuickFind: 843869

Mfr part code: CMW16GX4M2C3200C16

£ 68.99  inc. vat

£79.49save £10.50

£ 57.49 ex. vat

£66.24save £8.75
More Info

CORSAIR VENGEANCE DDR5 32GB (2x16GB) DDR5 5600 (PC5-44800) C36 1.25V - Black

  • 32GB (2 x 16GB)
  • 5600Mhz DDR5
  • Tested Latency 36-36-36-76
  • Voltage 1.25V

QuickFind: 1414614

Mfr part code: CMK32GX5M2B5600C36

£ 191.55  inc. vat

£279.99save £88.44

£ 159.62 ex. vat

£233.32save £73.70

0% Interest offers available

More Info

Corsair Vengeance RGB Pro SL 32GB (2x16GB) 3600MHZ DDR4 RAM - Optimized for AMD Ryzen

  • Voltage: 1.35v
  • Latency Timing CL18
  • Speed: 3600Mhz
  • (PC4-28800)
  • 2 x 16GB DIMM Memory

QuickFind: 1139146

Mfr part code: CMH32GX4M2Z3600C18

£ 113.99  inc. vat

£137.99save £24.00

£ 94.99 ex. vat

£114.99save £20.00

0% Interest offers available

More Info

Kingston FURY Beast 16GB (2x 8GB) 6000MHz DDR5 RAM - Black

  • Memory Size: 16GB
  • Latency Timing: CL40
  • Speed: 6000MHz
  • 2 x 8GB DIMM Memory

QuickFind: 1419977

Mfr part code: KF560C40BBK2-16

£ 129.48  inc. vat

£141.99save £12.51

£ 107.90 ex. vat

£118.32save £10.42

0% Interest offers available

More Info

Corsair Value Select 8GB DDR4 2400MHz RAM/Memory Module

  • Capacity: 8GB (1x8GB)
  • Speed: 2400MHz
  • Latency Timing: CL16
  • Form Factor: DDR4 UDIMM
  • Warranty: Limited Lifetime

QuickFind: 1413694

Mfr part code: CM4X8GF2400C16N2-OEM

£ 26.99  inc. vat

£28.98save £1.99

£ 22.49 ex. vat

£24.15save £1.66
More Info

Kingston FURY Beast 32GB (16GB x 2) 5200MHz DDR5 CL38 DIMM Memory - Black

  • 32GB (16GB x 2)
  • 5200Mhz DDR5
  • Improved stability for overclocking
  • Increased efficiency
  • Intel® XMP 3.0-Ready and Certified

QuickFind: 1327597

Mfr part code: KF552C40BBK2-32

£ 154.98  inc. vat

£233.50save £78.52

£ 129.15 ex. vat

£194.58save £65.43

0% Interest offers available

More Info

Kingston FURY Beast 16GB (2 x 8GB) 3200MHz DDR4 RAM - Black

  • Capacity: 16GB (2x8GB)
  • Speed: 3200MHz
  • Latency Timing: CL16
  • Form Factor: DDR4 UDIMM
  • Warranty: Limited Lifetime

QuickFind: 1265314

Mfr part code: KF432C16BBK2/16

£ 63.57  inc. vat

£ 52.97 ex. vat

More Info

Corsair Vengeance RGB PRO Black 16GB 3600 MHz DDR4 Dual Channel Memory Kit

  • Capacity: 16GB (2x8GB)
  • Speed: 3600MHz
  • Latency Timing: CL18
  • Form Factor: DDR4 UDIMM
  • Warranty: Limited Lifetime

QuickFind: 919328

Mfr part code: CMW16GX4M2D3600C18

£ 72.99  inc. vat

£80.84save £7.85

£ 60.82 ex. vat

£67.36save £6.54
More Info

KLEVV 32GB (2X16GB) BOLT X DDR4 3600MHZ

  • Capacity: 32GB (2x16GB)
  • Speed: 3600MHz
  • Latency Timing: CL18
  • Form Factor: DDR4 UDIMM
  • Warranty: Limited Lifetime

QuickFind: 1426386

Mfr part code: KD4AGUA80-36A180U

£ 102.99  inc. vat

£ 85.82 ex. vat

0% Interest offers available

More Info

KLEVV 16GB Kit (2X8GB) CRAS X RGB GAMING DDR4 3600MHZ PC4-28800 1.35V CL18

  • Capacity: 16GB (2x8GB)
  • Speed: 3600MHz
  • Latency Timing: CL18
  • Form Factor: DDR4 UDIMM
  • Warranty: Limited Lifetime

QuickFind: 1143123

Mfr part code: KD48GU880-36A180X

£ 62.99  inc. vat

£67.98save £4.99

£ 52.49 ex. vat

£56.65save £4.16
More Info

G.SKILL TridentZ RGB Series 32GB (2 x 16GB) DDR4 3200Mhz DIMM CAS 16

  • Capacity: 32GB (2x16GB)
  • Speed: 3200MHz
  • Latency Timing: CL16
  • Form Factor: DDR4 UDIMM
  • Warranty: Limited Lifetime

QuickFind: 1133809

Mfr part code: F4-3200C16D-32GTZR

£ 133.70  inc. vat

£ 111.41 ex. vat

0% Interest offers available

More Info

CORSAIR VENGEANCE RGB PRO 32GB (2x16GB) DDR4 3600 (PC4-28800)

  • 32GB (16GB x 2)
  • 3600Mhz DDR4
  • Dynamic Multi-Zone RGB Lighting
  • Compatible with iCue Software

QuickFind: 1146865

Mfr part code: CMW32GX4M2D3600C18

£ 116.99  inc. vat

£133.49save £16.50

£ 97.49 ex. vat

£111.24save £13.75

0% Interest offers available

More Info
Showing 1 - 24 of 248 results
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Desktop PC memory stores the programmes and applications that are running on a computer, including the operating system. Referred to as RAM (Random Access Memory), it's installed in the PC as modules typically in banks of 4 or 8GB. Generally speaking, the more memory a computer has, the more easily it can cope with multitasking.

Shopping for PC Memory?

When shopping for new RAM it's important to remember that size isn't everything. More RAM will allow you to multi-task or use larger applications more easily, however RAM is also graded on speed. Higher DDR certifications typically run more quickly, with the exact speed measured in MHz. It's important to check you're buying RAM that is compatible with your build. The DDR version used of your new RAM must match the version supported by your motherboard, otherwise you won't be able to install it. Your motherboard will also have a maximum amount of RAM supported - double check you have enough free slots before buying an extra stick of RAM.

What is DDR4 memory?

DDR4 RAM is the latest generation of Double Data Rate memory. That means that DDR4 RAM runs at higher speeds than older generations - but the capacity is still the most important factor when it comes to your memory needs. DDR4 RAM improves the 'clock speed' from the previous generation, which is the speed at which it can read and write data.

If you need to get a little more performance out of your gaming PC, upgrading to DDR4 RAM (as long as your machine is compatible!) might be a good way to go about it, compared to the high costs of a new graphics card or processor.

What is RAM in a computer?

RAM stands for Random Access Memory, a form of volatile memory that stores information temporarily. It doesn't store files the way that your hard drive does - this memory can be retrieved from your system's RAM, which is much quicker than reading data from the hard drive. Once an application no longer requires this information, or once the system is shut down, this information is discarded and the RAM can be reused.

What does RAM do?

RAM is essentially a form of high-speed, short-term memory for your system - it temporarily stores all of the data it thinks your computer might need in that moment or the near future. This means when an application or user requires this data, the system can retrieve it more quickly. Modern operating systems often pre-cache applications and data in unused RAM to improve system responsiveness.

How much RAM do I need?

The more programs or processes you're running, the more RAM you need. So if you're just typing an essay in Microsoft Word, for example, a computer with low RAM might be able to handle that - but if you're simultaneously streaming music, browsing the internet with a few tabs open, watching a quick video clip on a news site, editing a document and running a sweep with antivirus software, your system needs more memory to handle all of those processes at once, and to let you multitask and switch between them.

Modern desktop PCs, laptops, tablets and even phones might have somewhere from 4GB up to 32GB of RAM. For reference, Windows 10 takes 2GB of RAM just to run, so you'll almost certainly need more. But it's still worth remembering that as much as having more RAM is better, at a certain point, adding more RAM to your PC won't make it go any faster.

8GB is fine for basic multitasking and casual users, and can handle a little bit of gaming, but if you want to use your PC or laptop for something a bit more intensive, you'll want to move up. 16GB of RAM is great for Windows and Mac users, and good for gaming, but serious gamers will want to be looking at 32GB upwards in order to get great performance without freezing or lagging. If you're a professional who needs to edit huge image files or video, then you might want to go even higher, past 64GB up to a whopping 128GB.

What is ROM and RAM in computer?

The essential difference between ROM and RAM is their core purpose - RAM is intended for temporary storage in order to speed up computing processes, and therefore needs power to retain information.

ROM, including hard drives and SSDs, is non-volatile, meaning these formats store data over the long-term. Read Only Memory is necessary for storing important files, programs, and the operating system when they are not in use, so that these can be restored at a later date.