mersenneforum.org  

Go Back   mersenneforum.org > Great Internet Mersenne Prime Search > Hardware

Reply
 
Thread Tools
Old 2016-04-12, 22:30   #100
Prime95
P90 years forever!
 
Prime95's Avatar
 
Aug 2002
Yeehaw, FL

2·3·1,193 Posts
Default

30+6mm M3 standoffs:
http://www.amazon.com/100pcs-Female-...ilpage_o00_s00

35+6mm standoffs:
http://www.amazon.com/100Pcs-Brass-S...ilpage_o00_s00

Total distance between boards -- 65mm.

more spacers:
http://www.newegg.com/Product/Produc...9SIA67038S9273
http://www.newegg.com/Product/Produc...9SIA67038S9287

power switches:
http://www.ebay.com/itm/301694042052...%3AMEBIDX%3AIT

12V plugs:
http://www.ebay.com/itm/262321746827...%3AMEBIDX%3AIT

32GB USB sticks:
http://aaawave.com/p-29611-mushkin-m...ash-drive.aspx

cheap memory, cpu, mobo:
http://www.newegg.com/Product/Produc...82E16820231962
http://www.newegg.com/Product/Produc...82E16819117563
http://www.newegg.com/Product/Produc...82E16813157678

efficient psu:
http://www.newegg.com/Product/Produc...82E16817438055

picopsu:
http://www.mini-box.com/picoPSU-90

Or you could try the 80W version, but the 4A limit on 12V scared me:
http://www.mini-box.com/picoPSU-80
plus a P4 cable: http://www.mini-box.com/4-Pin-P4-Mini-Power-Cable

I already recycled an old case, case fans, and network switch. I already owned the tools and supplies to make custom length ethernet cables.

Several items above are in largish quantity as my current plan is build one of these beasts each year.
Prime95 is offline   Reply With Quote
Old 2016-04-16, 19:10   #101
bgbeuning
 
Dec 2014

22·32·7 Posts
Default i5-6400T timings (post 1 of 3)

There was some discussion about the T versions of skylake.
Here are some benchmark results

i5-6400T uses 45 W when running stress test and cost $150 from Amazon.

Intel(R) Core(TM) i5-6400T CPU @ 2.20GHz
CPU speed: 2346.43 MHz, 4 cores
CPU features: Prefetch, SSE, SSE2, SSE4, AVX, AVX2, FMA
L1 cache size: 32 KB
L2 cache size: 256 KB, L3 cache size: 6 MB
L1 cache line size: 64 bytes
L2 cache line size: 64 bytes
TLBS: 64
Prime95 64-bit version 28.7, RdtscTiming=1
Best time for 4096K FFT length: 21.482 ms., avg: 21.520 ms.
Timing FFTs using 2 threads.
Best time for 4096K FFT length: 11.201 ms., avg: 11.228 ms.
Timing FFTs using 3 threads.
Best time for 4096K FFT length: 8.011 ms., avg: 8.078 ms.
Timing FFTs using 4 threads.
Best time for 4096K FFT length: 6.935 ms., avg: 7.014 ms.

Timings for 4096K FFT length (1 cpu, 1 worker): 19.31 ms. Throughput: 51.79 iter/sec.
Timings for 4096K FFT length (2 cpus, 2 workers): 20.51, 20.51 ms. Throughput: 97.50 iter/sec.
Timings for 4096K FFT length (3 cpus, 3 workers): 23.46, 23.66, 23.46 ms. Throughput: 127.51 iter/sec.
Timings for 4096K FFT length (4 cpus, 4 workers): 27.27, 27.15, 27.18, 27.42 ms. Throughput: 146.75 iter/sec.
bgbeuning is offline   Reply With Quote
Old 2016-04-16, 19:14   #102
bgbeuning
 
Dec 2014

3748 Posts
Default i5-6600T timings (post 2 of 3)

i5-6600T uses 57 Watts when running mprime stress test and cost $226 from nextwarehouse.com

All 3 postings use the ASrock H110-ITX MB with DDR4-2400 RAM.

Intel(R) Core(TM) i5-6600T CPU @ 2.70GHz
CPU speed: 3096.83 MHz, 4 cores
CPU features: Prefetch, SSE, SSE2, SSE4, AVX, AVX2, FMA
L1 cache size: 32 KB
L2 cache size: 256 KB, L3 cache size: 6 MB
L1 cache line size: 64 bytes
L2 cache line size: 64 bytes
TLBS: 64
Prime95 64-bit version 28.7, RdtscTiming=1
Best time for 4096K FFT length: 16.418 ms., avg: 16.446 ms.
Timing FFTs using 2 threads.
Best time for 4096K FFT length: 8.764 ms., avg: 8.835 ms.
Timing FFTs using 3 threads.
Best time for 4096K FFT length: 6.902 ms., avg: 7.041 ms.
Timing FFTs using 4 threads.
Best time for 4096K FFT length: 6.494 ms., avg: 6.572 ms.

Timings for 4096K FFT length (1 cpu, 1 worker): 15.60 ms. Throughput: 64.09 iter/sec.
Timings for 4096K FFT length (2 cpus, 2 workers): 17.06, 17.06 ms. Throughput: 117.23 iter/sec.
Timings for 4096K FFT length (3 cpus, 3 workers): 20.77, 20.79, 20.76 ms. Throughput: 144.42 iter/sec.
Timings for 4096K FFT length (4 cpus, 4 workers): 25.82, 25.82, 25.77, 25.79 ms. Throughput: 155.04 iter/sec.
bgbeuning is offline   Reply With Quote
Old 2016-04-16, 19:18   #103
bgbeuning
 
Dec 2014

22×32×7 Posts
Default i5-6500 timing (post 3 of 3)

Included for calibrating my results with other peoples results.

I5-6500 uses 67 Watts when running mprime stress and cost $180 from Microcenter

None of the 3 tests had BIOS voltage changes.

Intel(R) Core(TM) i5-6500 CPU @ 3.20GHz
CPU speed: 3097.33 MHz, 4 cores
CPU features: Prefetch, SSE, SSE2, SSE4, AVX, AVX2, FMA
L1 cache size: 32 KB
L2 cache size: 256 KB, L3 cache size: 6 MB
L1 cache line size: 64 bytes
L2 cache line size: 64 bytes
TLBS: 64
Prime95 64-bit version 28.7, RdtscTiming=1

Best time for 4096K FFT length: 16.487 ms., avg: 16.512 ms.
Timing FFTs using 2 threads.
Best time for 4096K FFT length: 8.736 ms., avg: 8.803 ms.
Timing FFTs using 3 threads.
Best time for 4096K FFT length: 6.812 ms., avg: 6.900 ms.
Timing FFTs using 4 threads.
Best time for 4096K FFT length: 6.384 ms., avg: 6.453 ms.

Timings for 4096K FFT length (1 cpu, 1 worker): 15.21 ms. Throughput: 65.73 iter/sec.
Timings for 4096K FFT length (2 cpus, 2 workers): 16.41, 16.43 ms. Throughput: 121.79 iter/sec.
Timings for 4096K FFT length (3 cpus, 3 workers): 19.89, 19.98, 19.92 ms. Throughput: 150.54 iter/sec.
Timings for 4096K FFT length (4 cpus, 4 workers): 25.30, 25.31, 25.27, 25.16 ms. Throughput: 158.36 iter/sec.
bgbeuning is offline   Reply With Quote
Old 2016-04-19, 15:36   #104
ramshanker
 
ramshanker's Avatar
 
"Ram Shanker"
May 2015
Delhi

3710 Posts
Default

Latest picture ?
ramshanker is offline   Reply With Quote
Old 2016-04-19, 15:39   #105
Mark Rose
 
Mark Rose's Avatar
 
"/X\(‘-‘)/X\"
Jan 2013

2·31·47 Posts
Default

Thanks for those benchmarks!
Mark Rose is offline   Reply With Quote
Old 2016-04-19, 19:01   #106
Prime95
P90 years forever!
 
Prime95's Avatar
 
Aug 2002
Yeehaw, FL

11011111101102 Posts
Default

Quote:
Originally Posted by ramshanker View Post
Latest picture ?
In a week when CPUs 6 and 7 are in place.
Prime95 is offline   Reply With Quote
Old 2016-04-24, 15:32   #107
Prime95
P90 years forever!
 
Prime95's Avatar
 
Aug 2002
Yeehaw, FL

11011111101102 Posts
Default

Ugh.

CPUs #6 and #7 are up and running. That's great. But, I happened to run a throughput benchmark on CPU #5 and it is 10% slower than all the others. I've run pmbw and it is definitely a memory bandwidth problem, i7z reports the CPU speed is the expected 3.3 GHz. Surprisingly, I swapped the DDR4 sticks with another CPU and the problem remains. So the problem is either in the motherboard or CPU. CPU #5 is on the bottom of the stack, so now I have to disassemble the entire stack and swap the CPU to isolate the cause.

Moral of the story, if you embark on a similar project test the throughput of every unit before putting it all together.

Last fiddled with by Prime95 on 2016-04-24 at 15:33
Prime95 is offline   Reply With Quote
Old 2016-04-24, 20:14   #108
Prime95
P90 years forever!
 
Prime95's Avatar
 
Aug 2002
Yeehaw, FL

2×3×1,193 Posts
Default

Swapped the CPU - still slow. For grins, swapped the PicoPSU -- still slow.

So it seems we have a defective motherboard. I'll check for a BIOS before beginning the RMA process.
Prime95 is offline   Reply With Quote
Old 2016-04-25, 11:39   #109
bgbeuning
 
Dec 2014

22·32·7 Posts
Default

Quote:
Originally Posted by Prime95 View Post
So it seems we have a defective motherboard. I'll check for a BIOS before beginning the RMA process.
Might check the CPU temp.
When they get too hot they reduce the clock to cool themselves.
bgbeuning is offline   Reply With Quote
Old 2016-04-25, 15:37   #110
Prime95
P90 years forever!
 
Prime95's Avatar
 
Aug 2002
Yeehaw, FL

2×3×1,193 Posts
Default

Quote:
Originally Posted by bgbeuning View Post
Might check the CPU temp.
When they get too hot they reduce the clock to cool themselves.
temps in 50s, i7z says it is running at 3.3 GHz.
Prime95 is offline   Reply With Quote
Reply

Thread Tools


Similar Threads
Thread Thread Starter Forum Replies Last Post
A dream, will stay a dream ( new Nvidia Quadro) firejuggler GPU Computing 0 2018-03-28 16:02
@ George Gordon GMP-ECM 2 2017-09-04 04:05
Dream Build cappy95833 Hardware 10 2014-03-29 15:02
Dream PC plandon Hardware 39 2009-08-30 09:36
He had a dream fetofs Puzzles 8 2006-07-09 09:33

All times are UTC. The time now is 04:28.

Thu Nov 26 04:28:41 UTC 2020 up 77 days, 1:39, 4 users, load averages: 1.71, 1.85, 1.83

Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2020, Jelsoft Enterprises Ltd.

This forum has received and complied with 0 (zero) government requests for information.

Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation.
A copy of the license is included in the FAQ.