DDR2 (2x1GB) at 500+Mhz / 4-4-4-12

[vob150]

Which set of 2x1GB will get me to 500+Mhz at 4-4-4-12?

My MB (P35-DSR3) can push 520+ and I would like my DRAM to run at those speeds (with tight timings).

Thanks

 

[drakore]

Hmmm most Micron D9 DDR2-800 modules should be able to. To be safe i would recommend getting DDR2-1066 modules. Crucial ones are a good price and guaranteed D9's. For DDR2-800 modules the crucial ones, or if you can get them buffalo firestix should be able to do around 1100.

I am kind of curious how you plan on doing 520 FSB...

 

[F1N3ST]

The ones you PMed me opn are guaranteed D9 because it says so on the chip lol.

Bare (Naked) (w/o heatspreader) are best for OCing anyways and you can strap a nice 120/2x80mm fans on them and watch them go.

 

[catalysts17az]

just stay away from OCZ. check out my thread for proof on this, i posted it on 9-16-07 titled "proof OCZ is not all that"

 

[SerpentRoyal]

There is no "guarantee" when you overclock RAMs. 500MHz @ 4-4-4-12 may be challenging for many modules. You may need to add a lot of Vdimm and provide good cooling. There isn't that much gaing in performance between 4-4-4-12 and 5-5-5-15 (about 50 to 60MHz bump in core speed).

 

[myocardia]

This is the only RAM that's guaranteed to run @ those timings, at that speed.

 

[BonzaiDuck]

I'm uncertain what six years during the 90s of teaching "Computer Architecture" would contribute in the way of "expert insight." Besides, the Chairman "threw that course" at me, and while it stuck, it wasn't exactly my "forte' at the git-go. Take it with a grain of salt, but I'm actually expressing my own introspective uncertainty here -- as opposed to finding an implicit way to pound my shoe on the table of our discussion. I'm really uncertain about it!

But here's my understanding about high-performance memory and divider ratios other than 1:1.

If the memory runs in native mode at DDR2-800 or 800 Mhz, and the default speed of the processor implies an "external frequency" or CPU-FSB of 266 Mhz and FSB of 1066 Mhz, then the divider ratio is 2:3. If the divider ratio is 2:3, then the CPU is throwing 2 bits to the memory in the number of clock-cycles that the memory would be able to otherwise process 3 bits, and if this is the case, there must be "wait-states" in the mix. Only certain types of memory operations would benefit from this situation.

So -- ceteris paribus -- I'd think that very little is gained that way.

Now look at the memory timings or "latencies." The lower or tighter the latency settings, the fewer clock-cycles necessary to process a single memory operation. Therefore, latency settings of 3,3,3,6 are better than settings of 4,4,4,10. Assuming you want to keep memory voltage at -- or below-- the factory warranty spec (in most cases these days it's 2.2 or 2.1V, depending on the brand) -- there will be a trade-off between the latency settings and the speed in Mhz. We all know that -- or at least many of us here do.

Whether the benchmarks or "synthetic' or otherwise, I can run my Crucial Ballistix DDR2-1000 modules at DDR2-720 using latency settings of 3,4,4,8 and a 1T command rate, and I get bandwidth benchmarks that exceed DDR2-800 @ stock latency settings. And at DDR2-800, these (PC2-8000 or DDR2-1000) modules need latency settings closer to 4,4,4,10 -- on this motherboard, with this processor, and at a DIMM voltage that is "set" at 2.15V (because this provides a sensor reading of 2.19 to 2.21V, and I'm not inclined to push it further.]

I buy the high-performance RAMs to take a reasonable risk that they can run at lower speeds with much tighter latency settings, and the Crucial Ballistix, made by Micron (as many of us are well aware [but not all of us]) -- do just that. I had verified, in addition to the manufacturer being one and the same with Micron, that these particular modules use the D9 "black parts."

But i don't buy DDR2-1000 modules so that I can run them at DDR2-1000, especially if I need to use a divider differing from 1:1.

Comment? Response? I'm all ears.