Non-GPU Factors
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Non-GPU Factors
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Send message Joined: 25 Feb 14 Posts: 15 Credit: 53,918,886 RAC: 0 Level  Scientific publications   
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I was wondering how factors such as ram speed, channels, pcie bandwidth, solid state drives, processor/chipsets effect our GPU crunching speed. Any thoughts? |
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Send message Joined: 28 Jul 12 Posts: 819 Credit: 1,591,285,971 RAC: 0 Level  Scientific publications 
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I moved my GTX 660s from a P45 motherboard with an E8400 dual-core (3 GHz) to a Haswell i7-4790 on a Z97 motherboard with no observable change in speed (both with SSDs), if that gives you any indication. I think if you went to a x4 PCIe slot you might see some reduction, but otherwise any differences would be hard to find. |
 Beyond Send message Joined: 23 Nov 08 Posts: 1112 Credit: 6,162,416,256 RAC: 0 Level  Scientific publications 
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I was wondering how factors such as ram speed, channels, pcie bandwidth, solid state drives, processor/chipsets effect our GPU crunching speed. ram speed: not much if any channels: no pcie bandwidth: PCIe 2.0 x8 or above = no difference, x4 = a little slowdown (PCIe 3.0 x4 should be full speed) solid state drives: not at all processor/chipsets: lets just say that a 1.8GHz dual core Celeron on a cheapo mini ITX MB runs a 750Ti at full speed with 2 CPU apps running (on a PCIe 2.0 x8 slot no less) |
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Send message Joined: 25 Feb 14 Posts: 15 Credit: 53,918,886 RAC: 0 Level Scientific publications
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Update: I upgraded my computers memory from 1333Mhz to 1600Mhz, my cpu from a fx-6300 to an i7-4790k, and my motherboard from a MSI GD80 (chipset 990fx) To MSI Gaming 7 (chipset z97), I went from pcie 2.0 x16 to 3.0 x16. My graphics card remained a 780ti and my hard drive a Sandisk Extreme II ssd. I notice a reduction of a few minutes on long runs. In comparison Overclocking my card to 1256Mhz and offsetting the memory to +84Mhz will shave about 45 minutes off a 7 hour run (with Kboost enabled). |
skgiven Send message Joined: 23 Apr 09 Posts: 3968 Credit: 1,995,359,260 RAC: 0 Level Scientific publications  |
Your hardware performance gain (of around 10%) was lost when you went from XP to W8.1. FAQ's HOW TO: - Opt out of Beta Tests - Ask for Help |
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Send message Joined: 25 Feb 14 Posts: 15 Credit: 53,918,886 RAC: 0 Level Scientific publications
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My computer is primarily a gaming rig :D. As much as I would like to load a second os system and let it run all the time while I'm away, my parents would freak out about the power bill. Once I'm off to college living in a dorm room, I'll be sure to run it all the time. |
Chilean Send message Joined: 8 Oct 12 Posts: 98 Credit: 385,652,461 RAC: 0 Level  Scientific publications 
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Your hardware performance gain (of around 10%) was lost when you went from XP to W8.1. Why exactly is XP faster than Win 8.1 (or 7...)? 
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 Send message Joined: 17 Aug 08 Posts: 2705 Credit: 1,311,122,549 RAC: 0 Level  Scientific publications |
With Vista MS introduced a new display driver model, which encapsulates the GPU more. It makes it easier to avoid crashing the whole GUI or system in case of a graphics error, but this also means the GPU driver is "further away" from the actual hardware. Or put another way: the overhead for some GPU driver functions increased to gain stability. MrS Scanning for our furry friends since Jan 2002 |
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