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Rimlance 4GB (1X4GB) 1.2V DDR4 2666MHZ PC4-21300 UDIMM 1RX8
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Rimlance 4GB (1X4GB) 1.2V DDR4 2666MHZ PC4-21300 UDIMM 1RX8
  • CAS Latency: CL19
  • Chipset: Major Brand Chipset
  • Buffered/Registered: Unbuffered
  • Model #: RUD21300S8C4
  •  
  • $41.99 
  • Free Shipping
ADATA XPG 16GB 6000MHz Lancer Blade RGB DDR5 U-DIMM White AX5U6000C3016G-SLABRWH
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ADATA XPG 16GB 6000MHz Lancer Blade RGB DDR5 U-DIMM White AX5U6000C3016G-SLABRWH
  • Capacity: 16GB
  • Speed: 6000MHz
  • Model #: 1.AX5U6000C3016G-SLABRWH
  •  
  • $591.90 
  • Free Shipping
Rimlance 4GB (1X4GB) 1.5V DDR3 1600MHZ PC3-12800 UDIMM 1RX8
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Rimlance 4GB (1X4GB) 1.5V DDR3 1600MHZ PC3-12800 UDIMM 1RX8
  • CAS Latency: CL11
  • Chipset: Major Brand Chipset
  • Buffered/Registered: Unbuffered
  • Model #: RUD12800S8C4
  •  
  • $19.59 
  • Free Shipping
Rimlance 4GB (1X4GB) 1.5V DDR3 1333MHz PC3-10600 UDIMM 1RX8
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Rimlance 4GB (1X4GB) 1.5V DDR3 1333MHz PC3-10600 UDIMM 1RX8
  • CAS Latency: CL9
  • Chipset: Major Brand Chipset
  • Buffered/Registered: Unbuffered
  • Model #: RUD10600S8C4
  •  
  • $17.63 
  • Free Shipping
CMP64GX5M2X6600C32 Corsair Dominator Titanium 2x32 64GB DDR5-6600MHz Memory
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Corsair
CMP64GX5M2X6600C32 Corsair Dominator Titanium 2x32 64GB DDR5-6600MHz Memory
  • Brand: CORSAIR
  • Part Number: CMP64GX5M2X6600C32
  • Parts: 30 Days
  • Labor: 30 Days
  • Model #: CMP64GX5M2X6600C32-New
ADATA RAM XPG Lancer Blade RGB DDR5 U-DIMM 16GB 6000MHz AX5U6000C4816G-SLABRBK
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  • $493.90 
  • Free Shipping
Mushkin Enhanced 4GB Essentials DDR3 1333MHz PC3 10666-240-Pin Desktop Memory Model 991769
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Mushkin Enhanced 4GB Essentials DDR3 1333MHz PC3 10666-240-Pin Desktop Memory Model 991769
  • CAS Latency: CL9
  • Voltage: 1.50V
  • Timing: 9-9-9-24
  • Color: N/A
  • Model #: 991769.
  •  
  • $76.99 
RIMLANCE 16GB(2x8GB) DDR4-2666(PC4-21300) non-ECC Unbuffered Desktop Memory Kit
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RIMLANCE 16GB(2x8GB) DDR4-2666(PC4-21300) non-ECC Unbuffered Desktop Memory Kit
  • CAS Latency: CL19
  • Multi-channel Kit: Dual Channel Kit
  • Buffered/Registered: Unbuffered
  • Model #: RLMUD-21300-2/16-28
  •  
  • $139.00 
  • Free Shipping
RIMLANCE Ram 16GB DDR4-2666 (PC4-21300) 288-Pin desktop memory
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RIMLANCE Ram 16GB DDR4-2666 (PC4-21300) 288-Pin desktop memory
  • CAS Latency: CL19
  • Chipset: Major Brand Chipset
  • Buffered/Registered: Unbuffered
  • Parts: Lifetime warranty
  • Model #: RLMUD-21300-16-28-0702
  •  
  • $125.99 
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RIMLANCE Ram 16GB DDR4 2133 (PC4-17000) 288-Pin desktop memory
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RIMLANCE Ram 16GB DDR4 2133 (PC4-17000) 288-Pin desktop memory
  • CAS Latency: CL15
  • Chipset: Major Brand Chipset
  • Recommend Use: High Performance or Gaming Memory
  • Buffered/Registered: Unbuffered
  • Model #: RLMUD-17000-16-28-0700
  •  
  • $120.39 
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RIMLANCE Ram 8GB DDR3-1866 (PC3L-14900)  240-Pin desktop memory
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RIMLANCE Ram 8GB DDR3-1866 (PC3L-14900) 240-Pin desktop memory
  • CAS Latency: CL13
  • Chipset: Major Brand Chipset
  • Recommend Use: High Performance or Gaming Memory
  • Buffered/Registered: Unbuffered
  • Model #: RLMUD-14900-8-28-0700
  •  
  • $33.43 
  • Free Shipping
SAMSUNG 1GB DDR3 1333 (PC3 10600) Desktop Memory Model M378B2873FHS-CH9
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SAMSUNG
Refurbished SAMSUNG 1GB DDR3 1333 (PC3 10600) Desktop Memory Model M378B2873FHS-CH9
  • CAS Latency: CL9
  • Voltage: 1.50V
  • Buffered/Registered: Unbuffered
  • Model #: M378B2873FHS-CH9
  •  
  • $17.08 
  • $39.99 Shipping
Lexar Memory LD4AU008G-B3200GSST 8GB 3200 MHz DDR4 U-DIMM - Desktop Memory
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  • $149.90 
  • Free Shipping
ADATA XPG Lancer Blade RGB DDR5 UDIMM 6400MHz 16GB ram memory AX5U6400C3216G-SLABRWH
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  • $617.90 
  • Free Shipping
G.Skill RAM DDR5 32GB 2x16GB 6000 Trident Z5 RGB Silver 6000J3040F16GX2-TZ5RS
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  • $1,182.90 
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G.Skill RAM DDR5 32GB 2x16GB 5200 CL40 Flare X5 EXPO/XMP 5200J4040A16GX2-FX5
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  • $878.90 
  • Free Shipping
8GB RAM-8GDR4A1-UD-2400 DDR4-2400 PC4-19200 288-Pin UDIMM RAM Replacement Memory for QNAP
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8GB RAM-8GDR4A1-UD-2400 DDR4-2400 PC4-19200 288-Pin UDIMM RAM Replacement Memory for QNAP
  • Voltage: 1.20V
  • Chipset: Major Brand Chipset
  • Buffered/Registered: Unbuffered
  • Parts: 5 Years
  • Model #: QN8GB2400DTA1r1b8-TZSpecificMPN/NE
  •  
  • $97.16 
  • $9.99 Shipping
Crucial Pro Overclock DIMM Ram 16GB DDR5 6400Mhz CL38 White CP16G64C38U5W
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  • $489.90 
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8GB RAM-8GDR4A0-UD-2400 DDR4-2400 PC4-19200 288-Pin UDIMM RAM Replacement Memory for QNAP
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8GB RAM-8GDR4A0-UD-2400 DDR4-2400 PC4-19200 288-Pin UDIMM RAM Replacement Memory for QNAP
  • Voltage: 1.20V
  • Chipset: Major Brand Chipset
  • Buffered/Registered: Unbuffered
  • Parts: 5 Years
  • Model #: QN8GB2400DTA0r1b8-TZSpecificMPN/NE
  •  
  • $97.16 
  • $9.99 Shipping
8GB RAM-8GDR4-LD-2133 DDR4-2133 PC4-17000 288-Pin UDIMM RAM Replacement Memory for QNAP
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8GB RAM-8GDR4-LD-2133 DDR4-2133 PC4-17000 288-Pin UDIMM RAM Replacement Memory for QNAP
  • Voltage: 1.20V
  • Chipset: Major Brand Chipset
  • Buffered/Registered: Unbuffered
  • Parts: 5 Years
  • Model #: QN8GB2133DTr2b8-TZSpecificMPN/NE
  •  
  • $107.24 
  • $9.99 Shipping
8GB 4X70G88313 DDR4 2133 Udimm PC4-17000 RAM Replacement Memory for Lenovo
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8GB 4X70G88313 DDR4 2133 Udimm PC4-17000 RAM Replacement Memory for Lenovo
  • Voltage: 1.20V
  • Chipset: Major Brand Chipset
  • Buffered/Registered: Unbuffered
  • Parts: 5 Years
  • Model #: LE8GB2133DTr2b8-MGSpecific1aMPN/NE
  •  
  • $107.24 
  • $9.99 Shipping
8GB 4X70R38787 DDR4 2666 Udimm PC4-21300 RAM Replacement Memory for Lenovo
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8GB 4X70R38787 DDR4 2666 Udimm PC4-21300 RAM Replacement Memory for Lenovo
  • Voltage: 1.20V
  • Chipset: Major Brand Chipset
  • Buffered/Registered: Unbuffered
  • Parts: 5 Years
  • Model #: LE8GB2666DTr1b8-MGSpecific1aMPN/NE
  •  
  • $97.16 
  • $9.99 Shipping
8GB 4X70G88331 DDR4 2133 Udimm PC4-17000 RAM Replacement Memory for Lenovo
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8GB 4X70G88331 DDR4 2133 Udimm PC4-17000 RAM Replacement Memory for Lenovo
  • Voltage: 1.20V
  • Chipset: Major Brand Chipset
  • Buffered/Registered: Unbuffered
  • Parts: 5 Years
  • Model #: LE8GB2133DTr2b8-MGSpecificaMPN/NE
  •  
  • $107.24 
  • $9.99 Shipping

Desktop Memory

System memory is where a computer holds the programs and data that are currently in use. The definition of the word "memory" has become somewhat blurred over the years because there are different types of memory that a computer uses. In general, "memory" refers to the system memory, or RAM, which holds instructions that the processor uses, and the data the instructions work with.

System memory is directly related to the performance of your computer. In some ways, it's even more important than the processor, because without enough memory, your processor cannot work to its full potential. Newer programs require more memory than older ones, so when buying a new computer, get the most memory that you can afford.

Learn about Types of System Memory

There are many different types of system memory available. Researching them will help you make an informed choice when you purchase your computer. Getting the right kind of memory for your system will also affect whether you can upgrade it later on, and by how much. With the right memory, you can move it from one system to another, or continue to use the same memory even after you upgrade your motherboard.

Types of memory include 168-pin SDRAM, 184-pin DDR SDRAM, 240-pin DDR2 SDRAM, and 240-pin DDR3 SDRAM. Capacity typically ranges from 128MB to 2GB with speeds covering PC 100, PC 133, PC 2100, PC 2700, PC 3200, PC 4000, PC2 3200, PC2 4200, PC2 5300, PC2 5400, PC2 6400, PC2 8000, PC2 8500, PC2 8800, PC2 8888, PC2 9136, PC2 9200, PC2 9600, PC2 10000, PC2 10400, PC3 8500, PC3 10600, PC3 10666, PC3 10700, PC3 12800, PC3 13000, PC3 14400, PC3 15000, and so on.

Bestselling Desktop Memory Reviews:

Sean P.
7/18/2026 11:05:08 AM
Nice and Colorful

“ This memory is great for my use case. ”

Team T-Force Delta RGB 32GB (2 x 16GB) 288-Pin PC RAM DDR4 3200 (PC4 25600) Desktop Memory Model TF3D432G3200HC16FDC01
Anonymous
7/2/2026 7:37:22 AM
Consistent reliable memory

“ Solid, no-frills RAM that just works. ”

Team T-FORCE VULCAN Z 16GB (2 x 8GB) 288-Pin PC RAM DDR4 3200 (PC4 25600) Desktop Memory Model TLZGD416G3200HC16CDC01
MICHAEL G.
7/1/2026 9:44:35 AM
Pricey, even for old RAM, but works.

“ Okay ram. ”

G.SKILL Ripjaws V Series 16GB (2 x 8GB) 288-Pin PC RAM DDR4 3200 (PC4 25600) Desktop Memory Model F4-3200C16D-16GVKB
Brian
6/19/2026 12:22:46 PM
Man, did I get lucky.

“ Got this last April, just before DDR4 prices also went through the roof. ”

G.SKILL Ripjaws V Series 64GB (4 x 16GB) 288-Pin PC RAM DDR4 3200 (PC4 25600) Desktop Memory Model F4-3200C16Q-64GVK
Joel H.
6/18/2026 10:15:33 AM
The RAM is too dang high!

“ It's DDR5 and works fine ”

CORSAIR Vengeance RGB 32GB (2 x 16GB) 288-Pin PC RAM DDR5 6000 (PC5 48000) Desktop Memory Model CMH32GX5M2B6000C38