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Old 19-12-2006, 09:01 AM   #1
JustRight
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Memory throughput difference E4 vs E6 CPU's

Hi all,

Posted this question over on overclockers.com.au, but thought I might try here as well as you guys have heaps of memory tuning experience.

Anyway, I've been playing around with an ASUS A8N32-SLI Deluxe with an X2 4600 and some OCZ PC4000 Gold (2Gb) memory.

Using the memory timings for this board and RAM from the Prime Stable database on the OCZ forums everything runs very sweetly. I'm running the FSB at 250Mhz with the memory running synchronously and a multiplier of 11 ie: CPU at 2750Mhz.

However I have got hold of an FX60 CPU to have a play with, and after installing the FX60, using exactly the same memory timings as for the X2 4600 the overall memory throughput dropped by quite a lot!

Just using memtest86 as a guide the reported throughput on the X2 4600 was 3330 Mb/s. But the FX60 only manages 2755 Mb/s. Thats a whopping 575 Mb/s slower??

Is there some fundamental difference between the memory controllers on the different revisions of these processors? The X2 4600 is an 'E4' revision whilst the FX60 is an 'E6'.

I have yet to have a play around with the memory timings, but I would have thought that a stable setup for one CPU would be OK for another CPU. Obviously not though. Does the FX60 require some different values somewhere in the timings. The A8N32-SLI has heaps of settings available for memory timings so it's a bit hard to know where to start.

Anyone got any ideas as to what might be going on?

Cheers.
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Old 19-12-2006, 09:40 AM   #2
JustRight
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Re: Memory throughput difference E4 vs E6 CPU's

Here is a quote from a reply I just got from the guys at OCZ. Very interesting.

"4600+ is a 2 x 512KB Cache CPU, FX-60 is a 2 x 1MB cache.....its been that way for a very long time, the 1MB chips show lower bandwidth in memtest."

Presumably this 'lower bandwidth in memtest' is just an artifact of memtest itself, and not an indication that the 2x1Mb CPU's actually have a lower mem throughput than their smaller siblings.

Cheers.
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Old 19-12-2006, 11:31 AM   #3
eva2000
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Re: Memory throughput difference E4 vs E6 CPU's

Yes mem bandwidth on X2 and Venice is higher clock for clock in memtest than Sandiego and FX-60 memory controllers.
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Old 19-12-2006, 12:37 PM   #4
JustRight
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Re: Memory throughput difference E4 vs E6 CPU's

Hi eva,

Does that mean that the overall memory performance of the 'smaller' CPU's is actually better? Or does a processor like the FX60 ultimately win out due to it's larger cache in actual use.

I've seen a number of screen shots of your system running an FX60 and a pair of 8800 GTS's over on overclockers.com.au, and it clearly does not lack any performance. I just was not expecting to see a bandwidth difference like that.

I guess the bottom line is to forget about it and just get the FX60 wound up some more

Thanks for your reply.
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Old 19-12-2006, 01:01 PM   #5
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Re: Memory throughput difference E4 vs E6 CPU's

means just that memtest bandwidth and everest reported bandwidth is slightly higher but larger cache wins out in benchmarks that count
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