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LOSTCIRCUITS

SHORTCUTS:
Top page
DQS and CAS latency
tRCD: the new limit?
CMD rate, chip numbers and PCB
Test Systems and Criteria
Micron, Crucial, Mosel-Vitelic
Nanya vs. Nanya, Corsair
256 MB: Corsair and Infineon
Performance: 128 MB DIMMs
Performance: 256 MB DIMMs and conclusion
 High Performance DDR DIMMs   
Ups and Downs or "how do I keep my stick happy?"
(Review by MS, July 17, 2001)


The Test Candidates

128 MB Density

After the above said, it should be clear that it is impossible to do a fair comparison between 128 and 256 MB DIMMs and for this reason the modules are grouped by density. To start out, let's take a look at where we came from:

Micron 128 MB Engineering sample 266 MHz

A double-sided 266 MHz CL2.5 Micron Engineering sample using two banks of 8Mx8 PC2100 DDR chips

<
> Crucial PC2100

Micron has discontinued the 8Mx8 DDR chips (64 Mbit density) since the production of 16Mx8 (128 Mbit) is more cost effective and allows higher density modules (256 MB in a double sided configuration). Note that all 8 chips are on one side.

Standard Crucial 128 MB Module as it is available from Crucial's On-Line store

Mosel-Vitelic PC2100

Mosel-Vitelic was kind enough to ship a few chips so that we could solder them onto a PCB for testing. The chips were untested Alpha Silicon without tweaks based on an Infineon Design. The cleaned up revision of these chips is supposed to run up to 166 MHz at 2:2:2 timing and a whopping 85 centigrades

A prototype of what the Mosel-Vitelic DIMMs might look like once they hit the street

Close-up of the Mosel-Vitelic chip. Markings and serial numbers may change in the final revision. In addition, Mosel-Vitelic is ramping up the production of 256 Mbit chips to allow for densities of 256 MBytes (single sided) and 512 MBytes (double sided) which will hit the streets within the next few weeks. One specialty of the Mosel-Vitelic chips is their extremely low power consumption that can be as little as 1/10 of comparable Samsung chips.

next page:    => Corsair, Nanya and Nanya =>

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