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Starting with our subsystem and CPU tests we'll see how the 3.06GHz processor does with i850e RDRAM both with HyperThreading on and off against the two comparison systems of 2.8GHz P4 with i850e RDRAM and XP2700+ with nForce2 DDR.
Hexus Pifast first, in this custom test we calculate the value of Pi to 10 million decimal places. This stresses FPU performance and also memory bandwidth with regular memory copies and CPU cache activity. It should also give us a clue as to how HyperThreading will help similar situations.
HyperThreading gives you just under 2s advantage over non HyperThreading
CPU scaling in full effect as the Pentium 4 manages to overtake the previous Hexus Pifast leader of XP2700+ with nForce2 low latency DDR. What's interesting to note is the ~1.9s advantage that HyperThreading gives us. Since we are running just a single copy over 2 processors with no CPU affinity, effecient dispatch of threads from the Windows scheduler to take advantage of a few more execution resources seems to help here.
On to MP3 encoding using LAME 3.92 and being a CPU limited task with emphasis on CPU cache performance and sheer clock speed, 3.06GHz P4 should do well here.
266MHz gives a nice scaling related boost
We see CPU scaling in effect and also our minimal HT related boost from effective scheduling that gives us a more efficient use of the CPU's execution resources. Not a huge gain, only 3 seconds, but it's a gain nonetheless.
Lastly on this page we have DVD to DivX conversion using VirtualDub and DivX 4.12 codec.
More CPU scaling and a nice HT benefit
Here we see a scenario where HyperThreading is allowed to have more of an effect. The data and instructions dispatched to the processor by the codec seem to allow a bigger benefit with HyperThreading enabled than we have seen up until now. Again, it's basically the processor being used more efficiently and of course we see the inevitable increase due to CPU scaling. All test systems can encode PAL DVD video using DivX 4.12 at greater than realtime speeds, a not inconsiderable achievement.
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