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Topic Title: opteron speed is not accurate
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Created On: 12/03/2003 10:36 PM
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 12/03/2003 10:36 PM
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thehighhat
Junior Member

Posts: 1
Joined: 12/03/2003

The good:
single Opteron 240 in a Thunder K8W mobo w/1GB 3200 ram in two slots
bios is latest from Tyan... reports cpu is a 240 and ram is running at 400MHz

The bad:
applications that report cpu or fsb speed never show accurate numbers...
the processor speed is usually around 1394MHz according to linux kernel and
windows xp pro (sandra, amd's cpuinfo, system properties dialog)
the fsb is 199 (winxppro sandra)

The ugly:
i only have one opteron....

so is there a way i can squeeze those last few MHz out of my box? is this normal?
 12/04/2003 12:05 AM
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ZapWizard
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Posts: 1393
Joined: 10/06/2003

You mean that the programs aren't reporting 1400mhz and 400mhz exactly?

This is due to a few factors... First off that 1400mhz is really closer to 1399.95mhz when running, the same for 400mhz, it is really closer to 399.95mhz.

This is due to the "Base Clock" of the crystal on the motherboard that drives the PLL's that generate the other clock numbers.

PLL's are Phase Lock Loops, they take a slow clock in, and duplicate and speed it up, and give a higher clock rates out.

The base clock on my SK8N reads 24.576mhz
(Printed on the Crystal package)

When multiplied mutliple times, the actual MHz will vary slightly due to the fractional variations in the clock.

So this is normal and fine, it also can be a counting issue with the software clock readers, that miss a few Mhz, while the CPU does low level tasks.


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 12/04/2003 04:51 PM
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Xtc4u
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Posts: 240
Joined: 10/10/2003

It's not just you mine reports same.

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