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Two green DDR2 DIMM modules with black chips, no heat spreader

Computer Memory Solutions

Computer Memory Solutions CM128644200DIMMDR 2GB (2 x 1GB) DDR2 533 memory upgrade

SKU CH-ET5D-F6Q5X

DDR2 533 memory kit adds 2 GB across two 1 GB unbuffered DIMMs for Dell Dimension C521 desktops

  • Total capacity2 GB (2 × 1 GB)
  • Rated speedDDR2 533 (PC2 4200)
  • ChipsetMajor Brand Chipset
  • CAS latencyCL4
  • Memory timings4-4-4
  • Rated voltage1.8 V
  • Guaranteed compatibility with Dell Dimension C521 desktop
  • 2GB total capacity supplied as two 1GB modules
  • DDR2 533 MHz speed rated at PC2-4200
  • CL4 latency timing at 4-4-4 for stable operation
  • 240-pin unbuffered non-ECC DIMM format

Dell Dimension C521 DDR2 Upgrade

This kit supplies two 1 GB DDR2-533 DIMMs for a total of 2 GB. It is built for owners of the Dell Dimension C521 desktop who want to add memory without changing the existing platform. The modules are unbuffered, non-ECC and run at 1.8 V.

DDR2-533 bandwidth ceiling

The PC2-4200 standard tops out at 533 MHz with a 4-4-4 timing cycle. That transfer rate is the hard limit of the DDR2 interface used by this system, so the kit cannot run faster than the board allows. Adding these sticks will not exceed the chipset’s native memory throughput.

Check free slots and 4 GB cap

The Dimension C521 has four DIMM sockets and a maximum supported memory of 4 GB. Verify how many slots are already occupied before ordering, because filling all four with 1 GB modules reaches that ceiling. The kit is a matched pair, so both sticks should be installed together for dual-channel operation.

How it compares

Measured against everything we stock in Model-Specific Memory Upgrades, at today’s prices. Recalculated every night.

Price $13.99
Cheaper than about 94% of the 21,161 comparable items (median $397.99).
Total capacity 2 GB (2 × 1 GB)
Lower than about 95% of the 20,941 comparable items (median 32 GB).
Price per GB $7.00 per GB
Cheaper than about 57% of the 20,941 comparable items (median $8.19 per GB).

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Specifications

Product
Brand nameComputer Memory Solutions
Model nameCM128644200DIMMDR
Total capacity2 GB (2 × 1 GB)
Product type240-Pin DDR2 SDRAM
Performance
Rated speedDDR2 533 (PC2 4200)
Processor
ChipsetMajor Brand Chipset
Memory
CAS latencyCL4
Memory timings4-4-4
ECC supportNo
Buffer typeUnbuffered
Memory rank2Rx8
Heat spreaderNo
Power
Rated voltage1.8 V
Compatibility
Compatible systemsDell Dimension C521 Desktop
In the box
Included items2 Memory RAM Sticks

Questions about this item

Should I choose the 2GB kit or a different capacity for my Dell Dimension C521?

The 2GB kit (2 x 1GB) fits the C521's four slots and leaves room to reach the 4GB maximum later.

What does the DDR2 533 speed mean once installed in the Dell Dimension C521?

The modules run at 533 MHz with CL4 timing, delivering PC2-4200 bandwidth for the system's memory controller.

Will the 240-pin DDR2 interface work without changes in the Dell Dimension C521?

Yes, the 240-pin DDR2 DIMMs match the C521's slots and operate at the standard 1.8V unbuffered specification.

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