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CPU Bottleneck

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December 11, 2010 8:12:22 AM

I am planning to use two GTX 460 Amp editions on my ASUS M4N75TD motherboard (SLI).


I still have to buy a processor for myself. Please tell me if an Athlon II x4 640 be a bottleneck if I am trying to use SLI with two GTX 460 Amp editions.

More about : cpu bottleneck

December 11, 2010 8:18:56 AM

I am not an expert on AMD cpu's, it looks like that is a Quad core, so as long as the speed is anywhere near 2.8 Ghz or higher, I would say that you should be fine.

I mean, the GTX 460 SLI setup, is rediculously powerful, but at the same time is very cost efficient, so even if you are getting *some* bottleneck then it is acceptable because how cheap the cards are.

It also matters what resolution you will be running, if you are doing a mild resolution of 1680x1050 then you will of course be limiting the ceiling of your setup, but you will get playable fps in every title.
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a c 88 Î Nvidia
December 11, 2010 6:48:10 PM

There will be no bottleneck. Even a dual core will not bottleneck anything short of a very high end GPU setup and that would be a weak dual core.

^+1 what annisman said about resolution.
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December 11, 2010 11:41:12 PM

thank you. So that means I can use an Athlon II x4 640 with GTX 460 SLI setup and later on upgrade to a Thuban processor.

You were talking about the resolution. I will just be upgrading the monitor to a 1680*1050 resolution. So does the GTX 460 SLI show any better performance gains when compared to a single card at 1680*1050 resolution.
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a b Î Nvidia
December 11, 2010 11:47:19 PM

For 1680x1050 a single GTX 460 will be excellent, especially when overclocked. Two will not give you much benefit except in extreme situations like maxing out settings/AA in Crysis/Metro 2033.
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December 11, 2010 11:57:52 PM

ok what I will do is, I will just go with a single GTX 460 for now on a 1680*1050 monitor, keep it for 2 years and later on add another GTX 460 on my sli motherboard. So within the span of these two years, there would be games that would require SLI even on a 1680*1050 resolution.

How does that sound!!!!!
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a c 88 Î Nvidia
December 12, 2010 12:14:59 AM

Sounds good.
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December 12, 2010 1:40:01 AM

yeah, I like it, but keep in mind, two years from now getting another 460 for SLI will seem like a poor choice for an upgrade, in two years there will be other cards the same price that the 460 is at now that will probably double it's performance.

IMO never plan to 'SLI in a year or two' it doesnt make money sense.
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a c 88 Î Nvidia
December 12, 2010 1:42:52 AM

At 1650 one GTX460 is plenty. Pretty much all you need at 1920 x 1080 as well........works for me anyway.
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a b Î Nvidia
December 12, 2010 2:11:25 AM

For a single GTX460 no, however if you are able to dig a little deeper try and look for a C3 stepping Phenom 2 quad (95w), there is a reason to want a cpu that has a unified L3 caches when each core has a discreet L2 cache. The problem is when each core is needing data and with cores are snooping data from each others cache it has a mirroring effect that waters down performance by a margin in certain apps and games. Beyond that for a single it is not a bottleneck however for sli it will be for lower res.
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December 12, 2010 2:41:41 AM

ok so SLI would not be a good option as annisman said. Huuh, why did I spend so much on a motherboard just to get SLI :pfff: 




Ok so for a single GTX 460, the Athlon II x4 640 nor a Phenom II x3 720 will be a bottleneck right!!!!!!


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a c 88 Î Nvidia
December 12, 2010 2:42:20 AM

irfan88 said:
ok so SLI would not be a good option as annisman said. Huuh, why did I spend so much on a motherboard just to get SLI :pfff: 




Ok so for a single GTX 460, the Athlon II x4 640 nor a Phenom II x3 720 will be a bottleneck right!!!!!!



Right.
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December 12, 2010 3:01:16 AM

ok then, its confirmed, I would be getting the Athlon II x4 640 or a Phenom II x3 720 along with a single GTX 460 Amp edition.


then after a couple of years, I would upgrade it to a thuban or a bull dozer (AM3+ but still I think it would be compatible with AM3 after updating its bios).
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December 12, 2010 3:14:03 AM

Don't get down on SLI just yet friend, SLI is a great way to game, but you have to be willing to buy both cards at once, instead of adding a second card some time later.
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a b Î Nvidia
December 12, 2010 5:44:11 AM

The thing is your resolution isn't high enough to warrant SLI considering a card like the GTX 460 is so reasonably priced and capable. It is a nice upgrade path to have though in case you upgrade your monitor or perhaps decide you want to try triple monitor gaming, 3D gaming, ect.
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December 12, 2010 9:27:37 AM

so for now, should I go with an Athlon II x4 640 or a Phenom II x3 720.
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a b Î Nvidia
December 12, 2010 10:45:11 PM

I'd go with the Phenom II x3 and try to unlock the 4th core in the BIOS. There's a very good chance it will work.
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December 12, 2010 10:59:06 PM

irfan88 said:
I am planning to use two GTX 460 Amp editions on my ASUS M4N75TD motherboard (SLI).


I still have to buy a processor for myself. Please tell me if an Athlon II x4 640 be a bottleneck if I am trying to use SLI with two GTX 460 Amp editions.


the term of "bottleneck" did only back in pentium 3/pentium 4 era. unless you're talking about quadfire or quad sli of gtx 580 and 5870 which would require core 2 q9xxx or above to handle it. otherwise even modern low end dual core cpu can run gtx 460 sli no problem.
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a b Î Nvidia
December 12, 2010 11:03:14 PM

That isn't so. Whether or not there is a CPU bottleneck will depend on the specific game, resolution and settings. There are games where even a 4ghz i7 will bottleneck something like SLIed GTX 460s even at high resolutions.
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December 13, 2010 2:14:02 AM

As annisman said, I dont need GTX 460 SLI at 1680*1050 resolution. So I have totally forgot about the SLI idea.


I am just going with a single GTX 460 or a 470 for now.

With regards to the processor, I would go with either an Athlon II x4 640 or a Phenom II x3 720. ok :) 


But my only question is, I want to run games like GTA 4 and metro 2033. So will the quad give me a better performance or a tri core CPU.
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December 13, 2010 2:48:55 AM

Tri will be fine, considering your gpu will limit you in those titles (more Metro than GTA) but if the quad is not much more, do that for future-proofing.
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December 13, 2010 3:02:30 AM

are you talking about the athlon II quad or the phenom II quad
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December 13, 2010 3:48:57 AM

Dude I have no idea what the difference is between those two, not an AMD guy.

Go get the better one of the two...
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a b Î Nvidia
December 13, 2010 4:50:36 AM

The Phenom II and the Athlon II are actually the same processing core. The Phenoms have L3 cache which can make a decent difference depending on the task, including gaming. There are a lot of games that still use just 2 cores and gaming will probably be the most intensive task you regularly give your CPU so I would take the L3 cache over the 4th core.
Here is a comparison of the two processors you are talking about;
http://www.anandtech.com/bench/Product/83?vs=122
They are basically tied in the overall Sysmark score and the quad core wins in most of the rest of the benchmarks because the tasks are highly multithreaded but if you scroll down to the gaming benchmarks the Phenom II x3 wins all 4 games they have listed.
Now that said all of the above will likely be irrelevant because the Phenom II x3 is actually a quad core processor with one of the cores locked. Most current motherboards(including yours) can attempt to unlock the 4th core in the BIOS. The odds are quite good(about 75% from what I've seen) that you will end up with a Phenom II x4 anyway.
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