You need to be looking at DUAL socket motherboards if you want 4-way x16 support. A single CPU does not have enough bandwidth (pins) to support true 4 by x16 - they cheat using pxii switches.
All the Exxact machines on the Amber website are dual socket by quad slot x16. Of course this makes them more expensive than the budget single socket systems you can build for sub $1000 (exc GPU cost).
All the best
Ross
On Jun 22, 2013, at 12:45, ET <sketchfoot.gmail.com> wrote:
> Looks like the Asus P9X79-E WS is for you then Scott! :) Haven't seen many
> (if any!) boards with that anount of bandwidth so far.
>
> br,
> g
>
>
> On 22 June 2013 19:31, Scott Le Grand <varelse2005.gmail.com> wrote:
>
>> It may be overkill now but I'm planning to revisit the Multi GPU code in
>> the near future and that's why I need a motherboard that can really take
>> advantage of it.
>> On Jun 22, 2013 10:12 AM, "ET" <sketchfoot.gmail.com> wrote:
>>
>>> Hi,
>>>
>>> Thanks v much for you specs Divi. :) I've been debating with myself as my
>>> board as it looks good and has a very nice spec. From what I've read, the
>>> only problems with it is the higher than average power draw.
>>>
>>> .Scott. I believe the board runs in x8/x8/x8/x8 for a 4 GPU config - so
>>> effectively PCI2 2.0 x16 rate. Would this present any problems, if you
>>> were running the serial GPU code, From what I read on the AMBER GPU
>>> hardware page, this is more important for the parallel GPU code? Though,
>> I
>>> imagine having 4x serial ruins going simultaneously would also tax the
>> GPU
>>> to CPU interface, though how much I'm not sure.
>>>
>>> Apparently, if you are going intel, you can only acheive PCIe 3.0 using
>> at
>>> least a Sandy Bridge-E or ivy bridge CPU in a socket 155. Please correct
>> me
>>> if I have understood this incorrectly though.
>>>
>>> http://www.enthusiastpc.net/articles/00003/3.aspx
>>>
>>>
>>> A socket 2011 proposition would be the Asus P9X79-E WES which has 2x PLX
>>> PEX 8747 chips so can run at x16/x16/x16/x16 with four GPUs
>>>
>>> https://www.asus.com/Motherboards/P9X79E_WS/#specifications
>>>
>>> However, I'm unsure whether this is overkill for running 4xGPUs doing
>> AMBER
>>> serial code.
>>>
>>> What do you guys think?
>>>
>>> br,
>>> g
>>>
>>>
>>>
>>> On 22 June 2013 16:15, Scott Le Grand <varelse2005.gmail.com> wrote:
>>>
>>>> Does this MB support full p2p at 16x PCIE Gen 3 speeds between all 4
>>> GPUs?
>>>> On Jun 21, 2013 4:09 PM, "Divi/GMAIL" <dvenkatlu.gmail.com> wrote:
>>>>
>>>>>
>>>>> ET:
>>>>> I am using GA-Z77X-UP7 that has PLX chipset and supports 3rd Gen
>>>> LGA1155
>>>>> socket. Bought together with 2 TITANS sometime in March.
>>>>> It has been running pretty stable 24/7 since then. I thought of
>>> buying
>>>>> two more titans later to fill all four slots. With so much mess
>> going
>>> on
>>>>> with TITANS, I put off that plan until the dust settles. You might
>>> want
>>>> to
>>>>> check new 4th GEN cpus and supporting motherboards as the Hardware
>> keep
>>>>> changing pretty rapidly these days.
>>>>>
>>>>> I have i5-processor with 16 GB ram and 256 GB SSD. All four PCI-E
>>>> lanes
>>>>> are X-16. It also has native X-16 link directly "hardwired" to
>>> CPU-lanes
>>>>> that will bypass PLX chipset, in case if you run single GPU. This
>> might
>>>>> reduce a bit of latency but not much. I get 35ns/day on FIX/NVE
>>> benchmark
>>>>> bypassing PLX chipset, but get about 34ns/day using PLX chipset (on
>>> TITAN
>>>>> of
>>>>> course!!). Not a deal breaker..
>>>>>
>>>>> Link below:
>>>>>
>>>>> http://www.gigabyte.com/products/product-page.aspx?pid=4334#ov
>>>>>
>>>>> HTH
>>>>> Divi
>>>>>
>>>>> -----Original Message-----
>>>>> From: ET
>>>>> Sent: Thursday, June 20, 2013 8:18 PM
>>>>> To: AMBER Mailing List
>>>>> Subject: [AMBER] Anyone running machines with Quad GPU setups
>>>>>
>>>>> Hi all,
>>>>>
>>>>> I was looking at getting a new mobo to run a quad GPU system. I was
>>>>> wondering if anyone has done this. If you could post the model & make
>>> of:
>>>>>
>>>>> 1) motherboard
>>>>> 2) CPU
>>>>> 3) RAM
>>>>> 4) Case
>>>>> 5) The aggregate estimate of ns in simulation you have run on your
>>> setup
>>>>> without issue,
>>>>>
>>>>> I would be much obliged! :)
>>>>>
>>>>> br,
>>>>> g
>>>>> _______________________________________________
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Received on Sat Jun 22 2013 - 13:30:02 PDT
