Core 2 QX6700 SSSE3 crunching time

[jezek]

Hello I am using optimalized app on several PC's and it runs great. But on my Kentsfield I run version 1.41 with SSSE3 and I have worst results than others with P4 @ 2.6GHz as I see. They doing it in 2 000s but my QX6700 in 4500s. Can somebody help me please?

[BenHer]

Not sure exactly what you are referring to...
Pehaps it could be each WU has an angle range that was used when it was collected at arecibo.

To compare how long a given WU takes for different optimized crunchers you need to make sure you are comparing WUs on each machine that have as close an angle range as possible.

Angle ranges are not reported in normal web areas when you are looking at your results pages, instead from a results page you must click on any link, under the Result ID column (for completed WUs) and look in the "stderr out" area for "True angle range:" or "ar=".

[jezek]

I'm sorry. I'm talking about same WU on 2 different PC with different application. 1.PC is QX6700 with SSE3 optimalized client 2.P4 @ 2.6GHz with un-optimalized client. They doing same WU (with same true angle rate).
My optimalized QX6700 had 4700second for this WU and really much slowest P4 with unoptimalized client needs only 2000s.I just want to know why? Is there problem in client?

[Jason G]

A couple of ideas there that may or may not apply:

first remember a Test WU is run on one core only: so it alone probably shouldn't run all that much faster than the p4  running one WU but:
1- In real use The kenstfield would run 4 workunits at once making the average WU time 4500/4 = 1125 secs ... approx twice as fast as the P4 ( @ 2000secs ) many people are eagerly awaiting a new appp for these cpus, you aren't alone.

2- The p4 would be running v2 stock apps? these are a lot newer ( better ? ) than 1.41 on most all other cpus except the core2's....

3 - people have been discussing on the seti@home forums about memory bandwidth coming into the problem,  4 processors competing on the same memory bus is a challenge and even people running Xeons with ram in quad channel mode are finding a bottleneck.

4 - let them run and compare individual RACS when stabilsed... that may be a more reliable judge.

Just some ideas, Wish I owned a kentsfield. Good luck finding out what's going on

jason

[msattler]

Yes, memory bandwidth is a MAJOR concern with a quad.  4 cores competing for memory access is a definate bottlneck.  If you are OC'ing, back off on the RAM timings and go for more bandwidth, it helps...I am here to tell ya.
Also, if you are just looking at crunching times in the last week or so....SETI has been parsing out a lot of crappy little WUs lately (trying to keep it polite, I could use other terms).  Cleaning the dusty tapes out of the vault (Matt's bookshelf).  Much crunch, few points.  The 1.41 app for the core 2 is the best thing going at this time overall, but it sure has a weak point, and they are it.
So, hang in there, check the results you are looking at to see if the rig you are ocmparing to is OCd or at stock speed.  Check your rig to see if you have thermal limiting downclocking your cpu.
Good luck and good crunching.

[jezek]

Thanks to all for their ideas. I didn't do any OC because I have cooling problems @ highter speeds.I'm running stock speed @ about 50°C (all cores) in full SETI. I think that the main problem is memory brandwidth.I have new Corsairs on the way and now runnig 667MHz CL5 in single channel that is the main problem. I forgot it... Ones more thanks for your time 

Fast,faster,fastest crunching.

[msattler]

Thanks to all for their ideas. I didn't do any OC because I have cooling problems @ highter speeds.I'm running stock speed @ about 50°C (all cores) in full SETI. I think that the main problem is memory brandwidth.I have new Corsairs on the way and now runnig 667MHz CL5 in single channel that is the main problem. I forgot it... Ones more thanks for your time 

Fast,faster,fastest crunching.

You should see a definate improvement by getting your RAM in dual channel mode.
And I would highly suggest looking into a better cpu cooling solution.  If you are running at 50c at stock speed, either your case temps are a bit high, or your cpu cooler is just not quite up to the task.  I have had great results with the Thermaltake Big Typhoon and Arctic Silver AS5, but if you check out the various OC'ing forums, other folks have their favorites as well.
Good luck and good crunching!

[jezek]

Thank you, I have now 2x1GB Corsair XMS2 800MHz CL4 in dual channel and it's crung very well   
As CPU cooler I'm using Thermalright Ultra 120 with Noctua 1200rpm fan. I have in PC Probe II about 43°C in full load and Core Temp tells me that cores have about 60-67°C thats ok I thing (Tjunction is 100°C).
With case you are right I must do something with airflow. Now I have 1200rpm intake and 800rpm outtake fan. And it's not enought I think.
Fast,faster,the fastest crunching... (by Intel) 

P.S. How fast you are going with QX6700? And with how high Vcore? I tried 3.2GHz @ 1.4V (QX6700 B3 revision ES)
Thanks

[CAPTAIN FUTURE]

I have an Intel D975XBX2 with the QX6700.

Intel Desktop Utilities tell me 22°C to go to max. (BOXed Fan on 2.000RPM) (room 22°C)

CoreTemp tell me 71 - 79 °C
I let run my QX6700 2,5 months with this temp... when the temps right... I would have burned my QX6700...
because:
I called Intel today: max. temp. 65°C ! 
http://processorfinder.intel.com/details.aspx?sSpec=SL9UL#

Yesterday: BOXed Fan on max. ~ 2.780 RPM and IDU shop me 30°C to the max.
CoreTemp tell me 61 - 69 °C

So I ~n't think that CoreTemp show you/us/me the right temps from the QX6700...


I had probs now with the Rev.2.2B...
Boinc frozen...

Now I have my PC off... 
ordered Arctic Silver 5, Thermalright SI-128...
Soon he will run again... with better temps... I hope!

[msattler]

Thank you, I have now 2x1GB Corsair XMS2 800MHz CL4 in dual channel and it's crung very well   
As CPU cooler I'm using Thermalright Ultra 120 with Noctua 1200rpm fan. I have in PC Probe II about 43°C in full load and Core Temp tells me that cores have about 60-67°C thats ok I thing (Tjunction is 100°C).
With case you are right I must do something with airflow. Now I have 1200rpm intake and 800rpm outtake fan. And it's not enought I think.
Fast,faster,the fastest crunching... (by Intel) 

P.S. How fast you are going with QX6700? And with how high Vcore? I tried 3.2GHz @ 1.4V (QX6700 B3 revision ES)
Thanks

Right now I am running at 3408mhz, 426 x 8, ram is at 532.5mhz/1065ddr speed, 5-5-5-10 timings.  Asus Probe shows 57c at full load, vcore is 1.42v in Probe, bios is actually set to 1.525.  Mobo is an Asus Commando.

[CAPTAIN FUTURE]

Right now I am running at 3408mhz, 426 x 8, ram is at 532.5mhz/1065ddr speed, 5-5-5-10 timings.  Asus Probe shows 57c at full load, vcore is 1.42v in Probe, bios is actually set to 1.525.  Mobo is an Asus Commando.

Hello!

If you take CoreTemp, which temps you have?

You saw maybe my posts with my temps...?

Friendly greetings!


EDIT:
I saw you use Arctic Silver 5...
How you used it...
You took only a small piece to the heatsink, or to CPU too?

[msattler]

Right now I am running at 3408mhz, 426 x 8, ram is at 532.5mhz/1065ddr speed, 5-5-5-10 timings.  Asus Probe shows 57c at full load, vcore is 1.42v in Probe, bios is actually set to 1.525.  Mobo is an Asus Commando.

Hello!

If you take CoreTemp, which temps you have?

You saw maybe my posts with my temps...?

Friendly greetings!


EDIT:
I saw you use Arctic Silver 5...
How you used it...
You took only a small piece to the heatsink, or to CPU too?

Asus Probes reads 56-57c, Coretemp reads 80-82c.  I believe the difference (anybody correct me if I am wrong) is that Probe's reading comes from a thermal diode in the cpu package the same as the bois hardware monitor does, and Coretemp is reading the DTS information directly from the cpu.  My understanding is that tthe DTS information is actuallly a more accurate reading of the actual cpu die temperature.
As far as the AS5 goes, I have lapped both my cpu and the bottom of the TTBT cooler that I use (I did not see much difference between lapped and non-lapped temps, but was making other changes at the same time, so did not have a direct A-B comparison).  I usuallly apply the AS5 to the surface of the cpu and then spread it out by using the edge of a credit card (a razor blade works well also) back and forth until I have a very thin, smooth coating of AS5 across the entire face of the cpu  I then mount the heatsink and remove it to check if I have the paste transferred evenly from the cpu to the heatsink, ensuring that the mounting is even and I have enough paste to join both surfaces.  You want to use as little paste as possible while still assuring full contact between the cpu and heatsink.  When this looks right, I than use the credit card again to carefully smooth the compound out on both the cpu and heatsink, and do the final mount.

[BenHer]

But hey...msattler....doesn't that give you razor thin performance margins???

[msattler]

But hey...msattler....doesn't that give you razor thin performance margins???

If you are asking my if my OC is on the edge, the answer is YES.  If I raise the fsb only 2 mhz, it will start to reboot every couple of hours.  Currently it will only reboot mebbe once a day, but still does not generate errors while Seti crunching.

[jezek]

Thank you, I have now 2x1GB Corsair XMS2 800MHz CL4 in dual channel and it's crung very well   
As CPU cooler I'm using Thermalright Ultra 120 with Noctua 1200rpm fan. I have in PC Probe II about 43°C in full load and Core Temp tells me that cores have about 60-67°C thats ok I thing (Tjunction is 100°C).
With case you are right I must do something with airflow. Now I have 1200rpm intake and 800rpm outtake fan. And it's not enought I think.
Fast,faster,the fastest crunching... (by Intel) 

P.S. How fast you are going with QX6700? And with how high Vcore? I tried 3.2GHz @ 1.4V (QX6700 B3 revision ES)
Thanks

Right now I am running at 3408mhz, 426 x 8, ram is at 532.5mhz/1065ddr speed, 5-5-5-10 timings.  Asus Probe shows 57c at full load, vcore is 1.42v in Probe, bios is actually set to 1.525.  Mobo is an Asus Commando.

Nice!   

I'm running at stock speed on the same board and the highest speed which I reached was 3500MHz 350x10, ram was at 450/900 ddr speed, 4-4-4-12 timings vcore 1.45 was set in BIOS. It has problems after few hours of ORHTOS Prime test.
I will try add some volts 
But I have worries about cooling I'm using Thermalright Ultra 120 with 1200rpm Noctua fan.

Your CPU must produce  much more than 130W on stock  . What cooler do you use?



I love this machine, it's performance is incredible.