What CPU for my custom build?

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Sparticus427

Sparticus427

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Nov 22, 2016
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This is the first time for me to post on here. Been a fan of these forums for a while though. I am putting together a GPU rendering computer for use with Blender Cycles. I have ordered some components but need some help with getting the right CPU. Here are the parts I have:

AS Rock X99 Taichi Mobo (LGA 2011-v3, Intel)
http://www.newegg.com/Product/Product.aspx?Item=N82E16813157719

Team Vulcan DDR4 2400 SDRAM (4x8GB)
http://www.newegg.com/Product/Product.aspx?Item=N82E16820313771

(2x) Hitachi Ultrastar 7K3000 7200 RPM 2TB HDD : http://www.newegg.com/Product/Product.aspx?Item=1Z4-001J-00078

(3x) GeForce GTX 580 3GB GPU
https://www.amazon.com/EVGA-CLASSIFIED-Dual-DualLink-Graphics-03G-P3-1595-AR/dp/B006MBP6FK/ref=sr_1_7?ie=UTF8&qid=1479827955&sr=8-7&keywords=gtx+580

The GPU's will typically handle the rendering so the speed will come from them. However, large scene may require CPU rendering. If that is the case, I want to make sure that even if it isn't the fastest CPU, it can handle the massive amounts of data. I will be dealing with cooling using aftermarket products so I just need the CPU. My Mobo supports 8 channels of RAM. While I doubt that will be necessary, I do not want to build a limited machine. Is there a CPU I can get that will handle large amounts of data and support all channels of my RAM without breaking the bank?

Thanks for any and all help.
 
Solution
Ecky
I'm curious as to why you've chosen GPUs released in 2010 (and are more than 6 years old).

If you're going with X99, you have very few CPU choices, and all of them are expensive. You have the:

6800K - 6 cores, 28 PCIe lanes ~$400
6850K - 6 cores, 40 PCIe lanes ~$500
6900K - 8 cores, 40 PCie lanes ~$1100
6950X - 10 cores, 40 PCie lanes ~$1600

If running 3 GPUs, it may or may not be necessary to go with a 40 PCIe lane CPU. If you don't have anything else that uses lanes, running them all in 8x should be fine.
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Ecky

Ecky

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Feb 3, 2013
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I'm curious as to why you've chosen GPUs released in 2010 (and are more than 6 years old).

If you're going with X99, you have very few CPU choices, and all of them are expensive. You have the:

6800K - 6 cores, 28 PCIe lanes ~$400
6850K - 6 cores, 40 PCIe lanes ~$500
6900K - 8 cores, 40 PCie lanes ~$1100
6950X - 10 cores, 40 PCie lanes ~$1600

If running 3 GPUs, it may or may not be necessary to go with a 40 PCIe lane CPU. If you don't have anything else that uses lanes, running them all in 8x should be fine.
 
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Solution
Sparticus427

Sparticus427

Commendable
Nov 22, 2016
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1,520


I am using the GTX 580's because according to Blender Cycles benchmarks, they still are not far behind the speed of the newer GPU's. They were the top dog a few years ago for that specific process, so my first build used two of them. I just picked up a third on EBAY for $100. That's why I am sticking with them. Right now, the TITAN X is the best, but it's $1200. My work computer runs two of them so I know the performance difference. Eventually I will replace the GPU's, but my focus is getting this machine up soon.

What about going with a Xeon?

Thanks for the input, I'll check out those CPU's.
 
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Sparticus427

Sparticus427

Commendable
Nov 22, 2016
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1,520
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Ecky

Ecky

Illustrious
Feb 3, 2013
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38,960
That's an interesting CPU, I wasn't aware of its existence. From Intel's spec sheet it looks like it's basically a "6 core i5" of sorts. It uses 4th gen Haswell cores rather than 5th gen Broadwell, has 6 cores and 6 threads with hyperthreading disabled, and has 40 PCIe lanes. The biggest issue with it is its low base clockspeed of 1.6ghz, which would make something like a 6800K close to 3x faster.

EDIT: However it's probably the cheapest thing you can stick in that socket and still have the PC boot, and if it provides adequate performance it could be a good choice.
 
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Sparticus427

Sparticus427

Commendable
Nov 22, 2016
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1,520


Cool. Thanks. I will likely wait until Friday and see what kind of deals I can get before making a purchase.
 
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