Core Duo T2500 what app?

[jezek]

Hi I have ntb with Core Duo T2500 which supports SSE3. It's better to use SSE2-PM version of Simon's app or use SSE3-P4/PD app?
Thank you for reply

[Josef W. Segur]

Hi I have ntb with Core Duo T2500 which supports SSE3. It's better to use SSE2-PM version of Simon's app or use SSE3-P4/PD app?
Thank you for reply

The SSE2-PM will be best. Those build options apply to the parts of the code which haven't been hand-tuned and the Core Duo architecture is most similar to PM.

In hand-tuned sections, the app tests each of the routines which the CPU can handle. So some SSE3 routines will probably be used even when running the SSE2-PM version.
                                                                             Joe

[hiamps]

Would the same apply to my Intel(R) Core(TM)2 CPU T5200 @ 1.60GHz? Whenever I run the auto installer it just runs the SSSE3-Intel Core 2 and quits saying that is the one.

[Simon]

No;

Core 2 Duo != Core Duo

Your CPU is a Core 2 class one, which crunches best with the version that got chosen for you.

HTH,
Simon.

[jezek]

No;

Core 2 Duo != Core Duo

Your CPU is a Core 2 class one, which crunches best with the version that got chosen for you.

HTH,
Simon.

Really? 

Core Duo is't the same as Core 2 Duo.
But your app. can be used on both? (Core Duo hasn't got SSSE3 instruction set)

So if I understand right I can use Core 2 optimalised applications on Core Duo CPU?

[Simon]

No,

you understood me incorrectly. What I mean:

Core Duo chips CAN NOT RUN SSSE3 APPS - But Core 2 Duo chips CAN run all SSE2/SSE3 apps. It's called backwards compatibility.

Everything clear now?

Regards,
Simon.

[jezek]

No,

you understood me incorrectly. What I mean:

Core Duo chips CAN NOT RUN SSSE3 APPS - But Core 2 Duo chips CAN run all SSE2/SSE3 apps. It's called backwards compatibility.

Everything clear now?

Regards,
Simon.

Yeah, I'm sorry for this fuss.

I read bad your reply and miss one post before, thats why I have this useless question.

I'm sorry one's more...

P.S. Your last optimalised app. is great it's speeds up my 2xP3 @ 1GHz by incredible 50%! 

Great work!

[Simon]

No problem.

Hey, glad you like it, too Joe, Ben and Alex came through with the goods.

It sped up my Xeon HT 3.0 GHz from ~450 RAC with both CPUs to over 800 with 2 CPUs, and ~620 with only one CPU. The largest speedups I saw were on slower computers, using SSE and SSE2.

Regards,
Simon.

[jezek]

No problem.

Hey, glad you like it, too Joe, Ben and Alex came through with the goods.

It sped up my Xeon HT 3.0 GHz from ~450 RAC with both CPUs to over 800 with 2 CPUs, and ~620 with only one CPU. The largest speedups I saw were on slower computers, using SSE and SSE2.

Regards,
Simon.

That's it definitelly.

My P4 HT 2.6GHz (SSE2) from about 350 RAC with both CPUs going now more than 530 RAC. 
On Core 2 Duo E6600 @ 3.2GHz it was from 1500 to 1650 RAC, that's inst as much as on older PC 

Great work, really!

[hiamps]

No problem.

Hey, glad you like it, too Joe, Ben and Alex came through with the goods.

It sped up my Xeon HT 3.0 GHz from ~450 RAC with both CPUs to over 800 with 2 CPUs, and ~620 with only one CPU. The largest speedups I saw were on slower computers, using SSE and SSE2.

Regards,
Simon.

I noticed that too. My 3.0 seemed to get the biggest boost. Went from 580 to 720 with 740 peaks.

[citroja]

I think that we can thank Intel for how confusing this post is....soon they will come out with a Core 4 Quad with 16 cores just to confuse people  ....j/k

-citroja

[Toffa]

Does the "SSE2 PM" rule still apply with the New 2.4 release - my lappie is a Core Duo T2500 with SSE3 according to cpuZ?

[Josef W. Segur]

Does the "SSE2 PM" rule still apply with the New 2.4 release - my lappie is a Core Duo T2500 with SSE3 according to cpuZ?

I think "SSE2 PM" is likely to be faster on your system, but none of the pretesters had a Core Solo or Core Duo system available. The additional instructions in SSE3 are generally not useful in SETI@home crunching, so I believe the architectural similarity is more important.

You could simply try each for a week or so, then stick with the one which seems better. We'd appreciate a followup post indicating which worked best on your system if you do that.
                                                                              Joe