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Old 2011-02-02, 17:31   #1
drh
 
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Default System Recommendation

I’m looking to have a system built for me, dedicated to this effort, and I’d like some input for the hardware specs.

I want to do some GPU computing, along with 1 or 2 cores doing P-1’s, and the rest doing either LL’s or LL-D’s.

I’m looking at a MB with 2 CPU sockets on it, and for my budget, I have a choice of installing (1) - Intel Xeon DP Six Core L5640 2.26Ghz 5.86GT/s 12mb 60w 1066Mhz, or (2) - Intel Xeon DP Quad Core L5520 2.26Ghz 5.86GT/s 8mb 60w 1066Mhz. Any suggestions as to which configuration will give me better performance?

I’m also looking to install about 8GB of Memory – DIMM 4096mb 1333 MHz Registered ECC DDR3 on each CPU if I go with the Quads, or DIMM 8192mb 1333 MHz Registered ECC DDR3 if I go with the Six Core … any opinions here?

Finally, which NV graphics card would you recommend for this config?

Thanks,
Doug
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Old 2011-02-03, 16:37   #2
henryzz
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Is 2 pcs not an option? That would be much cheaper as you could use desktop parts(and faster because you would get better parts).

Last fiddled with by henryzz on 2011-02-03 at 16:37
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Old 2011-02-03, 17:30   #3
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2 PC's is an option, just thought I'd get some efficiencies combining them. Have a recommendation on a CPU, Memory, and GPU?

Thanks,
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Old 2011-02-03, 19:11   #4
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GTX 480/GTX 580 with best factory OC is your choice.
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Old 2011-02-03, 19:17   #5
fivemack
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For a long time it's been better to get two PCs than a single two-socket PC; basically, the period in which the two-socket machine was unacceptably slowed down by the shared memory bus ended and was immediately followed by the period in which Intel sold CPUs for two-socket PCs at an inordinate premium.

(I do have a two-socket machine, a dual quad-core Opteron, because someone this time last year was selling 4GB DDR2 modules at £40 each on ebay and two quad-core Opterons at £95 each; with that sort of discount it seemed just about worth paying the full £350 price for a motherboard that could use them and £70 for the slightly exotic power supply it needed).

So: first, wait until Intel have sorted out the glitch with Sandy Bridge chipsets. Then for CPUs use Sandy Bridge i7 2600 (2600K if you like overclocking) to get the new architecture, high speed and hyperthreading; stick two 4G modules with each CPU; I would be tempted to use the on-CPU video on one of the PCs, on an H67 board, and stick a GeForce Ti 560 in the other on a P67 board. You'll need about a 600W power supply for the P67+560, 300W will be more than enough for the H67.
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Old 2011-02-04, 00:21   #6
Prime95
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Quote:
Originally Posted by fivemack View Post
Then for CPUs use Sandy Bridge i7 2600 (2600K if you like overclocking) to get the new architecture, high speed and hyperthreading ... and stick a GeForce Ti 560 in the other on a P67 board.
If you're goal is prime95 computing use a i7 2500K with no hyperthreading. Some apps can make use of hyperthreading, prime95 is not one of them.

If you're cost conscious, consider a GTX 460 board. The 560 board is faster, but the 460 board is significantly cheaper.

A agree with all previous posters, Xeon is not the way to go.
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Old 2011-02-04, 00:54   #7
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My goal is definitely prime95 computing, been doing it for almost 2 yrs now, and I'm addicted.

My next questions is which OS? 3 of my machines are running Win7-64. I have a little experience with *nix, but it's been many years. Is there that much performance difference between them?

Final question is, do all the programs showing up now, to utilize GPU's, require manual interaction with PrimeNet to get assignments, and if so, any projection as to when it will be supported in a similar manner as CPU's?

Thanks for all the suggestions. I'll start my research and shopping now. Keep up the good work ...

Doug
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Old 2011-02-04, 01:17   #8
Prime95
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Quote:
Originally Posted by drh View Post
My next questions is which OS?

Final question is, do all the programs showing up now, to utilize GPU's, require manual interaction with PrimeNet to get assignments, and if so, any projection as to when it will be supported in a similar manner as CPU's?
OS is irrelevant to prime95, but do select the 64-bit version. Linux will save money, but use whatever makes you most comfortable.

GPU programs are all manual right now. It will be a long time before these are incorporated into prime95. It isn't hard to reserve a lot of exponents manually, so it should be possible to set up a process where you only have to tend to the client once every few months.
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Old 2011-02-06, 02:46   #9
drh
 
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Quote:
Originally Posted by Prime95 View Post
If you're goal is prime95 computing use a i7 2500K with no hyperthreading.
Quick clarification - Should it be an i5 2500k or an i7 2600k?
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Old 2011-02-06, 03:26   #10
mdettweiler
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Quote:
Originally Posted by drh View Post
Quick clarification - Should it be an i5 2500k or an i7 2600k?
I would guess the i5-2500K since no i7's come with hyperthreading.
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Old 2011-02-06, 03:38   #11
Prime95
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Quote:
Originally Posted by drh View Post
Quick clarification - Should it be an i5 2500k or an i7 2600k?
My bad, I meant i5 2500K. This chip has no hyperthreading.

The i7 2600K does have hyperthreading, but costs a bit more.
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