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  • Render Machine CPU question

    Everyone,
    I am in the process of purchasing a dedicated machine for rendering for my office. The first priority is to produce images with 3DS Max and V-Ray. A very distant second would be to render images from Revit. Due to the "skills" of our particular IT department the option of a rack server is unavailable. Sadly this is because all of our current rack mounted servers sit on the ground. So I plan on getting a tower based system. The majority of images I produce and plan on producing are large format still shots. For printing I try to produce images at a resolution of 5000 x 3000. Very large I know but this is not negotiable at this time. The two platforms I have narrowed the decision to are the AMD Operton 6000 series @ 2.1 ghz and the Intel Xenon 5520. Both would be Dual Socket and the AMD would have 12 cores per socket, and the Intel platform 6 cores. The reason for not going to a more power Intel solution for me is cost.
    My first question is, does anyone know of a test with the above mentioned software, working on a scene which resembles the attached images in a rough order of magnitude, which compares the two cpu configurations?
    Secondly, is there any concrete issue with image quality when the image begins to be worked on by such a large number of cores? I use light cache in many instances for the secondary bounces and have read more threads can cause the light cache to be slightly noisier. I am very willing to deal with this with more cpu time as the secondary bounces are miniscule compared with the final render time.
    Thank you for your time in considering my post.

    Cheers,
    Attached Files

  • #2
    Hi Plewallen. There are no detrimental effects on image quality from scaling to more cores. Multithreading doesn't alter the way the image is handled by Vray. The image will look the same whether you render it on 1 core or on 100 cores.

    As for AMD versus Intel - the dual socket segment always carries a price premium, but for dedicated large frame renderings it's your best option. AMD and intel both know what their products can do and they price their products accordingly. All other things being equal, I've learned to stick to Intel for resale value alone. Here in the US Dell have some outstanding deals on tower servers. Just make sure to call in and speak to a sales rep - their online prices are for suckers.

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    • #3
      Update. I did find a new benchmark on the techreport which did show a comparison of the new bulldozer 8 core chips versus a Sandy Bridge based intel chip with 4 cores. The Sandy bridge chips were faster with just half the cores. It looks like I will be purchasing intel.

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      • #4
        hi, can u share the example www plz?
        CGI - Freelancer - Available for work

        www.dariuszmakowski.com - come and look

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        • #5
          Until I see some proper stats on the whole AMD vs Intel, I'm not so sure about paying the premium for Intel until I can see a difference that is worth it.
          (I've not read anything yet, so please feel free to show any reports, very, very keen to see as I'll be buying shortly as well).
          + I'm personally not bothered about selling anything.

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          • #6
            Get

            either 2x 2600k Intel CPU and OVERCLOCK it to 4.5 ghz= cheaper option
            Or get 2x Xeon E 5530/5520 and OVERCLOCK it to 4 ghz = more expensive option = u need EVGA SR 2 motherboard.
            CGI - Freelancer - Available for work

            www.dariuszmakowski.com - come and look

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            • #7
              Originally posted by DADAL View Post
              Get

              either 2x 2600k Intel CPU and OVERCLOCK it to 4.5 ghz= cheaper option
              Which motherboard can take 2 of those DADAL ?
              Sounds interesting

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              • #8
                2 separate machines....
                CGI - Freelancer - Available for work

                www.dariuszmakowski.com - come and look

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                • #9
                  Originally posted by DADAL View Post
                  2 separate machines....
                  Bugger.

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                  • #10
                    Yup it sux bit w8 new intel CPUs. I bet Eva will do something insane for servers
                    CGI - Freelancer - Available for work

                    www.dariuszmakowski.com - come and look

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                    • #11
                      Whatever you decide, just make sure you *do not* get a quad-processor AMD machine, they do not have a good performance for rendering at the moment. Single or dual-processor is ok, as far as we could test here.

                      Best regards,
                      Vlado
                      I only act like I know everything, Rogers.

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                      • #12
                        o Wow good to know thanks Vlado ! :O

                        Have you maybe tested the new 8 vore amds?
                        CGI - Freelancer - Available for work

                        www.dariuszmakowski.com - come and look

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                        • #13
                          Nope, just the 12-core AMDs.

                          Best regards,
                          Vlado
                          I only act like I know everything, Rogers.

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                          • #14
                            Vlado, Do you have any benchmarks to compare the 4p 12core amd with a dual xeon or single i7?

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                            • #15
                              Thank you for the definitive response Vlado as my plan was preciously to get dual 12 core AMD chips. So, I will not do that. I did see the article from the tech report regarding the new Sandy Bridge 2600 chips. As the server I am planning to acquire is to be a dual socket machine in a rack configuration. I also stumbled upon this benchmark. While the benchmark did not include Vray I hope it does help to shed some light by using a real life hardware situation.

                              http://www.anandtech.com/show/5058/a...rlagos-6200/12

                              In conclusion at this time, it appears that the Sandy Bridge architecture is so much more efficient per clock at that the performance per dollar equation equals out to lead to the intel solution. That being said the current plan is to build a two socket machine, with 8 cores per socket based on the new
                              Xeon e5 architecture. Since these chips have hyper threading this would mean 32 threads for a single frame of rendering. The operating system I plan on using is Windows 7 Professional 64 bit. Vlado, have you seen any performance issues with this configuration or type of configuration?

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