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Old 2004-11-05, 11:58   #1
thomasn
 
Jun 2003

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Default AMD Athlon 64 vs AMD Opteron for ecm

I am considering buying a new pc. And my choice falls on either an Athlon 64 or an opteron. I know that the Opteron has 1M cache instead of 512, and can be used in a dual configuration.
But I am somewhat confused, are there any other differences ? How much extra performance will the extra 512 K cache give (when doing ECM)?

Thomas
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Old 2004-11-05, 14:10   #2
Xyzzy
 
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I posted some numbers for a 1MB versus a 512KB L2 in the M1061 thread... From what I can tell there isn't much benefit to a larger L2...

The Opteron will allow you to use more memory easily... Most AMD64 boards slow the memory down a lot when you fill up all the slots, and there are numerous cases where you can't even populate all the slots without errors...

How much memory were you looking to have? That will answer all the other questions...
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Old 2004-11-06, 10:03   #3
thomasn
 
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Quote:
Originally Posted by Xyzzy
I posted some numbers for a 1MB versus a 512KB L2 in the M1061 thread... From what I can tell there isn't much benefit to a larger L2...

The Opteron will allow you to use more memory easily... Most AMD64 boards slow the memory down a lot when you fill up all the slots, and there are numerous cases where you can't even populate all the slots without errors...

How much memory were you looking to have? That will answer all the other questions...
Hmm. So basically you are saying that when using more than one ram slot you get a performace penalty ?

I either will have 1Gb (2x 512 Mb sticks) or 1.5 Gb (3x 512 Mb sticks).

Thomas
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Old 2004-11-06, 11:13   #4
Xyzzy
 
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I run 2x512 at DDR400... There is a very complicated chart in my motherboard manual that shows all the possible combinations... Once the 3rd slot is used the memory speed drops, sometimes to DDR200...
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Old 2004-11-06, 17:18   #5
thomasn
 
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So with an Athlon 64 one should try to have as few memory sticks as possible.
Thanks for the info !

Thomas
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Old 2004-11-07, 16:01   #6
Mystwalker
 
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I'm not sure about Athlon64/Opteron boards, but at least P4 boards use dual channel access to double the bandwidth. With 3 (in general: odd nummer) modules, this isn't possible anymore.
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Old 2004-11-08, 13:25   #7
geoff
 
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I upgraded my P4 from single channel DDR 400 to dual channel DDR 500, with no change to clock speed it has made almost no difference to ECM times. The only application that that I have noticed being much faster as a result is memtest86 :-)
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