I am thinking about running sli gtx580s and first i was wondering if my processor would bottleneck them, it is a 1090t running at 3.8ghz for my everyday oc. Also would my power supply be able to handle it, it is 1000w and is rated for sli but not sure if that really means it can handle these beasts.
Would my processor bottleneck?
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You're probably bottlenecked now and just don't know it, as you're playing at 1080p with a beastly card.
Only go SLI with AMD if you're going to go with surround, AMD can't push high end cards very well at 1080, you need a lot more gpu workload if you want to get anything from SLI.
Only go SLI with AMD if you're going to go with surround, AMD can't push high end cards very well at 1080, you need a lot more gpu workload if you want to get anything from SLI.
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Surprisingly, yes it will bottleneck. Also, your 1k PSU is fine.
Push that 1090T up to 4GHz, and your bottleneck will be minimum, but compared to an equivalent i7 2600k, you'd be losing 5 fps or more. Now, that'll probably be way above 60 fps, but if you were on a 120hz monitor, you might see a difference. My source on this is a thread from a few days ago, someone swapped TRI 580s onto a 5GHz 2600k and gained like 15 fps in basically everything.
EDIT: http://www.overclock.net/amd-cpus/97...1055t-can.html Here's my reference, I'm pretty sure at some point he talks framerates, but not in the OP.
Push that 1090T up to 4GHz, and your bottleneck will be minimum, but compared to an equivalent i7 2600k, you'd be losing 5 fps or more. Now, that'll probably be way above 60 fps, but if you were on a 120hz monitor, you might see a difference. My source on this is a thread from a few days ago, someone swapped TRI 580s onto a 5GHz 2600k and gained like 15 fps in basically everything.
EDIT: http://www.overclock.net/amd-cpus/97...1055t-can.html Here's my reference, I'm pretty sure at some point he talks framerates, but not in the OP.
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Cant offer an indepth opinion on the processor, but two 580s are very powerful. I think it really depends on the application's ability to utilize all 6 thuban cores and the total load it puts on CPU to really judge whether or not you'll be bottlenecked.
Also, i read up a bit on the PSU and it looks pretty solid. Should be able to handle 2 580s no problem.
Originally Posted by Razzal  I am thinking about running sli gtx580s and first i was wondering if my processor would bottleneck them, it is a 1090t running at 3.8ghz for my everyday oc. Also would my power supply be able to handle it, it is 1000w and is rated for sli but not sure if that really means it can handle these beasts. |
Also, i read up a bit on the PSU and it looks pretty solid. Should be able to handle 2 580s no problem.
I can't see a bottleneck happening, if the CPU is a good one it may even handle 4.2 just fine... try to run it up more on multiplier than on frequency.
SLI is designed to avoid bottlenecks, you may not completely maximize the advantage of the second card but you're definitely gonna get much of its boost.
SLI is designed to avoid bottlenecks, you may not completely maximize the advantage of the second card but you're definitely gonna get much of its boost.
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AMD will bottleneck at 1080p on a single lower end card, it stands to reason the two most powerful gpus on the market would cause major gpu usage problems at 1080p.
If the OP can get high enough res that the gtx 580s are only able to push around 60fps maxed out then he shouldn't be bottlenecked.
If the OP can get high enough res that the gtx 580s are only able to push around 60fps maxed out then he shouldn't be bottlenecked.
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Two things affect the degree (aka frequency and severity) of cpu-bottlenecking:
1) The level of cpu-dependency of the test (game/bench) you're running.
Loosely defined, this means "How much work does the GPU require of the CPU per frame rendered?". Various applications vary WILDLY in this regard. Not only is every application different, but it's an ever-shifting variable over the course of every test you ever run, and
2) The graphical difficulty level of the test (what game/res/settings) relative to the power of the graphics solution.
This is because the graphical difficulty (obviously) impacts the FPS at which the test is running, and hence how OFTEN the GPU makes requests for data from the CPU (see #1).
Since FPS is always going to vary, and the cpu-dependency is also always going to vary, depending on what's going on onscreen, the phenomenon of cpu-bottlenecking is a very dynamic situation.
Basically, on *every* frame *ever* rendered on your system, either the CPU or the GPU will be the bottleneck.
The bottom-line all this is, the faster your CPU is relative to your GPU(s), and the higher the level of graphical difficulty (and hence the lower the FPS), the less frequently it will be the case that the CPU will become the limiting factor to FPS, and the less severe the limitation will be when it occurs.
And there is no 'magic number' afa a clock speed goes ^^^ see my previous paragraph.
To answer the specific scenario at hand ... I think any present AMD setup is a bit underpowered for SLI580's, but you can of course still create gaming/testing scenarios where the BN would be mostly invisible ...
1) The level of cpu-dependency of the test (game/bench) you're running.
Loosely defined, this means "How much work does the GPU require of the CPU per frame rendered?". Various applications vary WILDLY in this regard. Not only is every application different, but it's an ever-shifting variable over the course of every test you ever run, and
2) The graphical difficulty level of the test (what game/res/settings) relative to the power of the graphics solution.
This is because the graphical difficulty (obviously) impacts the FPS at which the test is running, and hence how OFTEN the GPU makes requests for data from the CPU (see #1).
Since FPS is always going to vary, and the cpu-dependency is also always going to vary, depending on what's going on onscreen, the phenomenon of cpu-bottlenecking is a very dynamic situation.
Basically, on *every* frame *ever* rendered on your system, either the CPU or the GPU will be the bottleneck.
The bottom-line all this is, the faster your CPU is relative to your GPU(s), and the higher the level of graphical difficulty (and hence the lower the FPS), the less frequently it will be the case that the CPU will become the limiting factor to FPS, and the less severe the limitation will be when it occurs.
And there is no 'magic number' afa a clock speed goes ^^^ see my previous paragraph.
To answer the specific scenario at hand ... I think any present AMD setup is a bit underpowered for SLI580's, but you can of course still create gaming/testing scenarios where the BN would be mostly invisible ...
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You are bottlenecking right now. Hell my 920 bottlenecks my 560Ti. When benchmarking now the gpu's core clock really doesn't affect the score only the cpu's core clock does.
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