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Old 18th February, 2006, 05:55 PM
jnansley's Avatar
Join Date: May 2004
Posts: 888

9npaj, Htt

So, I was sort of forced into jumping on the A64 thing earlier than I planned.

Skimping on all of the expensive parts, my E6 Venice 3200+ stops somewhere less than 2600mhz with "+0.1V" but is happy running in the neighborhood of 2400mhz with stock voltage. Haven't tried 2500 yet.

My old faithful 2x512MB Crucial PC2700 tops out somewhere between 210 and 230mhz @ 2.5-3-3-11, in single channel ATM since I used the wrong slots.

I figured I'd go ahead and explore the limits of the motherboard straightaway, but I'm at 360mhz HTT and it seems to just keep going and going... I got bored.

I seem to remember hearing 'conventional wisdom' that maximizing HTT speed is the best. But when I think about that really hard I am having a little difficulty understanding how that actually makes any sense and I'd like to hear some thoughts on the topic.

I would like to skip the usual BS about "asynchronous" memory clocks since the people that don't spout it understand that "synchronous" access is simply an integral divider of the CPU speed in any case - the A64 uses your "ratio" in BIOS to select the nearest integer and the POST screen may actually misreport the results. ""1:1"" ratio is 1/[FID], where [stock FID] = 10 in my case.

For demonstration purposes, with 9x260 5:6 ("PC2700" ratio) the BIOS reports the memory speed 216(.67)mhz at POST, a memory divisor of 10.8. But, as reported by Windows tools, the actual memory speed in operation is 212mhz, a divisor of 11.

So there is no way to make memory access "asynchronous" no matter how hard you try.

With that whole mess out of the way, focusing purely on performance due to HTT...

Can there possibly be any performance difference between 10x200 (6:6) and 8x250 (5:6), understanding that:
the memory will run 200mhz in both cases (divisor = 10)
HT bus will be 1000mhz in both cases (multiplier = 5x -> 4x)
I have a kit.
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