Bottleneck GPU

[Kakou]

Hi everybody,

 

A bit of a background so you can understand what I am trying to achieve here.

 

I am currently running unRaid on my gaming rig (4790k, Asus Maximus V Gene, GTX 780Ti).

I have one Windows 10 virtual machine to run my games that I also use to stream to my Nvidia Shield TV.  The setup is awesome, no lag no drop of FPS.

 

I am going to upgrade my server in order to be able to run more than one VM, currently it is not possible, not enough core, and possibly 2 Gaming VM (I will have upgrade the GPU(s) later this year)

 

So of course I could get a 8 cores CPU from the latest Haswell or even with the new Broadwell-E I could spent a lot in a i7-6900K. Or I could learn from one of linus video and go for older generation Xeon E5 CPUs such as this one for example http://ark.intel.com/products/75790/Intel-Xeon-Processor-E5-2630-v2-15M-Cache-2_60-GHz, get 2 of those and spend less than the price of a last gen one.

 

Now here is my question, how low can I get in the frequency of these CPU before I bottleneck my GPU(s). Obviously the lower I can get, the less expensive it will be. Now I know Games uses a few thread only and benefit from high frequency, but this is not completely true now with DX12 and Vulkan. 

 

So do you think I could go for 2 of these http://ark.intel.com/products/75789/Intel-Xeon-Processor-E5-2620-v2-15M-Cache-2_10-GHz and still run all lastest game without bottlenecking (?) my GPU?

 

Then I will have memory and motherboard compatibility issue to think about, but one thing at the time.

 

Thank you everybody.

 

[ChrisCross]

5 minutes ago, Kakou said:

 

maybe ask someone to downclock their 6700k to 3ghz to test for the Intel Xeon E5-2620 v4. 

its 14nm up to 3ghz 16thread.

 

or go with a 6800k.

[Kakou]

Well actually this is a very good idea thanks. I had my friend downclock his 4930K. (6 cores)

 

Result with Heaven | UNIGINE

 

4.0Ghz - 1874

3.0Ghz - 1830

2.5Ghz - 1812

2.0Ghz - 1730

 

No GPU bottleneck.

 

The E5-2630v2 could be a winner, the E5-2620 could do it I as well, just a bit afraid of how long it would keep up.