why am i only 50% cpu when i am running super_pi??

[mbass32]

Hi chaps
I am wondering why super_pi is only using 50% cpu when i am running it??!!.I have checked affinity and both cpu bits are ticked and i tried just 1 at a time cpu 0 and cpu 1 and i just cant understand why?
I am running the following spec pc as i have now upgraded by mobo to aopen as i had abit vi7 before.

p4c{sl6z3} 2.4 at 3.01ghz {251 fsb} ram at 408mhz
1x512 kingston value ram at 2.5cas and 7-3-3
1x 512 NANYA ram at 2.5 cas and 7-3-3
AOPEN AX4SPE-UN mobo (865pe chipset }
2 x seagate 80gig ide 100udma drives
1 x dvd rom and 1x cdrw drive

when i run super_pi initially it uses 54% and first stage is done in 0.61 secs but then it drops to 50% and eventually when finishes with using only 50% cpu load i get 45.16 secs on 1M
so what is happening to me?? my temps arent bad at all 47.5 deg under 100% load running FAH and 3dmark together or anyother heavy using program.
but under windows it doesnt go above 36 deg case temp is 28-30 deg.
so can anyone explain why i am getting only 50% usage as i dont get why as surely if its got both ticked it should use both am i right?{the physical and the HT one}.
please can somebody tell me whats happening and how to sort it out to use all 100% so i can actually see a better result as at 50% its not a bad time for and old cpu overclocked eh.
thanks
mike

[[XC]Atomicpineapple]

Your CPU has HT technology, hence windows will see it as 2 CPUs, so its stressing your 1 logical core to its maximum, but only 1 of the 2 virtual cores that windows sees.

[mbass32]

i see what you are saying but why isnt it using the virtual core{s} as they are unused parts of the core that arent being used isnt it so surely this program should be able to stress all parts of the core shouldnt it ? otherwise i am not getting full use of my core am i??!!.as when i run otherprograms like 3d mark and otherprograms together it always uses 100% so i am now confused, and if i run extremecpu test program it uses 100% so that is why i dont get it.

thanks
mike

[mbass32]

well it still does 50% upping to 52% max, but if i then run another program then the cpu usage goes up to 100% so clearly this super_pi is not fully using the cpu which is a dissadvantage to any HT core pentium isnt it, so surely the people who wrote super_pi could set it up to fully utilise the HT cored p4 as in load it up like a dual core ie treat it like a duel core or something as i can easily load my cpu to 100% so this super_pi should as well shouldnt it, if i run any other benchmarking program can utilise 100% then super_pi should as well to give HT cored processors a fair run as clearly it isnt is it.
IE .my p4 {sl6z3} running at 251fsb with no voltage increase and stable as hell in any test i give it and when in real terms as in playing say BF2 online i can out perform a friend oc'd 3100+ with my set up and he has sata and i dont , he also has 6800GS graphics card unyet i can load up bf2 quicker and get into each level quicker i can even beat another chaps 3700+.so clearly when my system is loaded to the hilt it can outperform AMD theoretically quicker on this super_pi unyet in real life not as quick as my system so this proves that super-Pi is not giving us HT users a fair run is it?.

[mbass32]

right here goes
1M super_pi runs in 45.164 50%-52% cpu usage {not all running on real core about 20% on HT core 1

if i then start 2 lots of super_pi 1 on core 1 and 1 on core 0 and run 1m test again i get 100% cpu usage and i complete core 0 in 1 minute 2.426 and core 1 in 1 minute 3.144
so why is this? is that good for 2 instances of super_pi 1.5 running on my HT2.4c running at 3.025GHZ???

[Concorde Rules]

Because your real core isnt being used at 50%. Its using ALL of what is uses, FPU, SSE, SSE 2, whatever.

HT is only there because of Intels long pipelines so having two sets of data going down the pipes makes it quickler, all be it not much.

It is certainly not gonna perform like a dual core chip.

Conc