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  • Model: MX400
  • SKU: 3182337
From our expanded online assortment; compatible with up to 3 keyboards; high-quality components; ultralow-noise 4580 operational amplifiers; ultracompact design
Price Match Guarantee

Best Buy is dedicated to always offering the best value to our customers. We will match the price, at the time of purchase, on a Price Match Guarantee product if you find the same item at a lower price at a Designated Major Online Retailer or at a local retail competitor's store.

Here's how:
  • If you find a qualifying lower price online, call 1-888-BEST BUY and direct a customer service agent to the web site with the lower price, or when visiting a Best Buy store, one of our employees will assist you.
  • On qualifying products, Best Buy will then verify the current price to complete the price match.

Some exclusions apply. See the list of Designated Major Online Retailers and full details.

$24.99
You may compare up to four items at a time.

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  • Model: CM256646400DIMMX20220
  • SKU: 1306198835
4 GB (2 x 2 GB) - DDR2 SDRAM - 800 MHz DDR2-800/PC2-6400 - Non-ECC - 240-pin - DIMM
What is Marketplace?

Marketplace Items

  • are sold and shipped by Best Buy-approved third party retailers using our secure checkout; your credit card information stays with Best Buy
  • are not available in Best Buy stores
  • can only be returned to the Marketplace Seller

Learn More

$36.00
You may compare up to four items at a time.

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  • Model: CM128646400DIMMX20202
  • SKU: 1306193922
2 GB (2 x 1 GB) - DDR2 SDRAM - 800 MHz DDR2-800/PC2-6400 - Non-ECC - 240-pin - DIMM
What is Marketplace?

Marketplace Items

  • are sold and shipped by Best Buy-approved third party retailers using our secure checkout; your credit card information stays with Best Buy
  • are not available in Best Buy stores
  • can only be returned to the Marketplace Seller

Learn More

$20.00
You may compare up to four items at a time.

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  • Model: CM256646400DIMMX20204
  • SKU: 1306196251
2 GB (1 x 2 GB) - DDR2 SDRAM - 800 MHz DDR2-800/PC2-6400 - Non-ECC - 240-pin - DIMM
What is Marketplace?

Marketplace Items

  • are sold and shipped by Best Buy-approved third party retailers using our secure checkout; your credit card information stays with Best Buy
  • are not available in Best Buy stores
  • can only be returned to the Marketplace Seller

Learn More

$21.00
You may compare up to four items at a time.

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  • Model: CM256646400DIMMX20201
  • SKU: 1306194370
4 GB (2 x 2 GB) - DDR2 SDRAM - 800 MHz DDR2-800/PC2-6400 - 1.80 V - Unregistered - 240-pin - DIMM
What is Marketplace?

Marketplace Items

  • are sold and shipped by Best Buy-approved third party retailers using our secure checkout; your credit card information stays with Best Buy
  • are not available in Best Buy stores
  • can only be returned to the Marketplace Seller

Learn More

$36.00
You may compare up to four items at a time.

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  • Model: CM128646400DIMMX20203
  • SKU: 1306194127
2 GB (2 x 1 GB) - DDR SDRAM - 400 MHz DDR400/PC3200 - Non-ECC - 184-pin - DIMM
What is Marketplace?

Marketplace Items

  • are sold and shipped by Best Buy-approved third party retailers using our secure checkout; your credit card information stays with Best Buy
  • are not available in Best Buy stores
  • can only be returned to the Marketplace Seller

Learn More

$32.00
You may compare up to four items at a time.

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  • Model: CM256646400DIMMX20203
  • SKU: 1305536553
4 GB (2 x 2 GB) - DDR2 SDRAM - 800 MHz DDR2-800/PC2-6400 - 1.80 V - Non-ECC - Unregistered - 240-pin - DIMM
What is Marketplace?

Marketplace Items

  • are sold and shipped by Best Buy-approved third party retailers using our secure checkout; your credit card information stays with Best Buy
  • are not available in Best Buy stores
  • can only be returned to the Marketplace Seller

Learn More

$36.00
You may compare up to four items at a time.

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  • Model: CM256646400DIMMX20202
  • SKU: 1306195476
4 GB (2 x 2 GB) - DDR2 SDRAM - 800 MHz DDR2-800/PC2-6400 - 240-pin
What is Marketplace?

Marketplace Items

  • are sold and shipped by Best Buy-approved third party retailers using our secure checkout; your credit card information stays with Best Buy
  • are not available in Best Buy stores
  • can only be returned to the Marketplace Seller

Learn More

$36.00
You may compare up to four items at a time.

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  • Model: CM256646400DIMMX20229
  • SKU: 1305928389
4 GB (2 x 2 GB) - DDR2 SDRAM - 800 MHz DDR2-800/PC2-6400 - Non-ECC - 240-pin - SoDIMM
What is Marketplace?

Marketplace Items

  • are sold and shipped by Best Buy-approved third party retailers using our secure checkout; your credit card information stays with Best Buy
  • are not available in Best Buy stores
  • can only be returned to the Marketplace Seller

Learn More

$36.00
You may compare up to four items at a time.

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  • Model: CM256726400ECCDIMMX2002
  • SKU: 1306193649
4 GB (2 x 2 GB) - DDR2 SDRAM - 800 MHz DDR2-800/PC2-6400 - Non-ECC - Unregistered - 240-pin - DIMM
What is Marketplace?

Marketplace Items

  • are sold and shipped by Best Buy-approved third party retailers using our secure checkout; your credit card information stays with Best Buy
  • are not available in Best Buy stores
  • can only be returned to the Marketplace Seller

Learn More

$48.00
You may compare up to four items at a time.

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