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To: Mary Cluney who wrote (138378)6/29/2001 9:12:06 AM
From: Dan3  Read Replies (2) of 186894
 
New P4 Xeon test - The key differences revolve around packaging and dual-CPU support. The standard Pentium 4 is built into a 423-pin package, whereas the Xeon comes wrapped in a 603-pin package. The added pins carry the signals needed for cache coherency between the two CPUs.

and summary:

Test Analysis
In most cases, the performance of the Xeon proved something of a disappointment. For example, the Content Creation Winstone 2001 score was nearly 63% faster on a Pentium 4 1.7GHz system than the Xeon dual CPU rig. We tested and retested, and came up with the same results. We are at a loss to understand why the Tyan system performed so poorly relative to the P4 1.7GHz system. We are investigating this further with Tyan, and will report our findings as soon we understand what's happening.

Note that the Pentium 4 only had 256MB of RAM to boot. Even the streaming memory tests ran slower. At first, we thought the CPU wasn't really running at 1.7GHz, but several quick diagnostic checks disabused us of that notion. The one bright spot was Lightwave 6.5 in dual CPU mode. The time to render one frame of the scene was nearly cut in half.

To be fair, we were running an early BIOS, and its possible that improvements to the BIOS will improve memory throughput--we've sent his happen before, and the change can often be substantial. What we hope is that there isn't too much overhead being introduced by the 82803AA memory repeater hubs.
extremetech.com

Hey Paul - more clock throttling?
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