How to Choose DDR2 and GDR Ram

[Russell]

Through this topic I will try to light you in the jungle of the memory with its marks, its chips and its revisions. With final, it is not obvious to see there clearly. Generally, one cannot rather distinguish well their marks, their reputations, always not deserved besides, but seldom the chips which compose these memories whereas it is the key element of a good bar.

To help us in these difficult choices, one finds on the Net of the tests which are sometimes has to take with tweezers bus is:

1. the bars can be preselected by manufacturing.
2. or the revision of the bars available in the trade changed, without one being informed. Blow, the chips can be changed for an inferior quality to increase his profit (as at corsair).
3. or then, one can same have the 2 phenomists at the same time.

Blow one can buy bars more having tests than excellent and be found with a bar which is worth hardly value ram, but one will have to pay at the full price. I unfortunately made the experiment with corsair of it xms2 6400C4. More to read the associated subject.


Thus to try to clarify the situation, which is what one awaits from good bars memories?

1. a high frequency of operation.
2. tight timings.
3. an important capacity of overclocking.

To obtain these 3 points, the choice of the chips composing the memory is of primary importance, and there too there are various marks such as samsung and winbond, leader on the DDR1, hynix, elpidia, promotions, nanya like micron, leader on the DDR2 with his famous D9 chips.

On the following bond you will find the chips of the various memories at the different ones marks.


http://ramlist.ath.cx/ddr2/


Thus at the time your purchase, it is necessary not privileges the mark, but the chips composing your future bars! You can thus see for example that the great reputation to corsair, the chips present on the memories vary enormously according to the revisions. Thus it is to better privilege small marks trying to dissociate batch by offering bars of a more constant quality. Parmis the new marks there is cavity cell shock, teamgroup, gskill for its HZ (the km No and HK for example has bottom-of-the-range chips promotions) or then of the marks of contructor of chips as crucial who is a subsidiary company of micron.


Thus veiled, I hope that this small guide will be useful for you and I specify that I have any merit being given it acts only of one work of synthesis and a filling of a subject which misses in my opinion on HFR

Tests of RAM found on the Net.

Attention, the tests are sometimes has to take with tweezers because it may be that the bar of test is selected by manufacturing or that the revision changed. However, that can give information interesting but before deciding, it is to better check if they have sudden modifications.

[spookshow]

Without forgetting the business of the moment: 2*1 GB Crucial Stix PC5300 C3: appox. Rs.11550

[Jeffrey]

ordered last week to replace my to corsair xms2 6400C4! I would not fail to give my feedback above but it will be necessary a little to have patience because I could assemble them only in 2 weeks

[mauricio]

you know that there are on model chips to corsair XMS2 PRO
- cm2x1024-6400c4pro
- xms6404v2.2

[Rawko]

Micron BT series
Most people refer to these as "fatbody", due to the large package size (92-ball IC). The label on the IC package is either D9DQW (266MHz at cas4) or D9DQT (333MHz at cas5). Likes relatively low timings, 3-2-2 to 4-3-2, and higher voltages. Will do moderate MHz, but getting over 500-550MHz seems somewhat rare. Long term use over 2.5v will most likely degrade stability.

Micron B6 series
These are BT's replacement. D9GKX is the 400MHz, cas5 binned part, D9GMH is 333MHZ, cas5 and D9GCT is 266MHz, cas4. On average, GKX hits the highest speeds and GCT does the lowest. Good all around chips, should do 350-450MHz at 3-3-3, 450-600MHz at 4-4-3 or 4-4-4 and >500MHz at 5-5-4 or 5-5-5. Scales well with voltage like BT, but being made on a smaller process, long term use over 2.3 to 2.4v is not recommended.