Mersenne Rig (take 2)

[simon389]

This may be a bit of noob question, but is there any huge reason to get GPU crunching? For pure prime searching I'm feeling an i54670K is all I'm getting into.

[Prime95]

Originally Posted by simon389

This may be a bit of noob question, but is there any huge reason to get GPU crunching?

No, this project is all about doing what you want to do -- all contributions are welcome. GPUs are superb at trial factoring. This is great for helping the project eliminate candidates and garnering "CPU credit". However, GPUs can be expensive, burn up a lot of electricity and generate a lot of heat. Also, GPU trial factoring will not help you personally discover a new Mersenne prime.

[LaurV]

Originally Posted by Prime95

GPUs are superb at trial factoring

read not like a bit better, but like 10 to 50 times better, depending on gpu...

[simon389]

Thank the maker for Cyber Monday:

Memory: http://www.newegg.com/Product/Produc...82E16820233610
i5-4690k: http://www.newegg.com/Product/Produc...82E16819117372
PSU: http://www.newegg.com/Product/Produc...82E16817438018

Looking forward to this labor of love.

[TheMawn]

I missed the Cyber Monday sale price, but even the regular $240 for 2800 MHz isn't exactly terrible. I'll be interested to see how much further it drops. The 3000+ kits are still ridiculous, though.

[kladner]

Originally Posted by TheMawn

I missed the Cyber Monday sale price, but even the regular $240 for 2800 MHz isn't exactly terrible. I'll be interested to see how much further it drops. The 3000+ kits are still ridiculous, though.

That's for DDR4, 4x4 DIMMS?

[VBCurtis]

Originally Posted by kladner

That's for DDR4, 4x4 DIMMS?

The link in the post above it is for 2x4GB DDR3-2800. 8GB for $240.

I bought 4x4GB DDR4-2666 last week from newegg for $229. Timings are slightly looser, as is the way with DDR4 (CL16 in my case).

[kladner]

Ah! I did not make the connection.

[TheMawn]

http://www.newegg.ca/Product/Product...82E16820231799

I was fortunate enough to get this kit for $300 a long while back. The rest of the computer is coming shortly and I'm eager to put it to the test.

[simon389]

Alright... we're in the final stages of stress testing. As previously mentioned the chip is 4690K 3.5Ghz. I have gotten pretty solid boots pushing this proc up to 4.7Ghz @ 1.25v, but these collapsed when I ran the small FFT torture test in the latest version of Prime95. I see many overclockers not liking the newest version of the Torture Test since they feel it pushes their temps higher than normal, but since I'm doing distributed computing (and not gaming where there is room for error), I'm wanting a setup that is stable in any test.

Closest I've come so far is 4.3Ghz @ 1.125v on Win7 64-bit with DDR3 @ 2800 12-14-14. Cooled with a Thermaltake Water 3.0 kit. I think I applied the thermal compound a bit thick, so if I finally do get a stable OC I'll probably pull it off and reapply and see if temps go down. Under load it is @ 64C with a few instances of 68C if I run it for an hour. Anything higher than this freezes the computer (BSOD) though interestingly not once has Prime95 gotten any errors. I'm going to let this run all night and see how it fares. I may throw a few other stress test apps at it for good measure.

Thanks for your help in making this happen. I'm excited to rejoin this again.

Simon

Edit: Just connected my v.4 account. Good times.

[fivemack]

"not liking the newest version of the Torture Test since they feel it pushes their temps higher than normal"

I am not able rightly to apprehend the kind of confusion of ideas that could provoke such an attitude