Choosing a Gaming CPU: Single + Multi-GPU at 1440p, April 2013
by Ian Cutress on May 8, 2013 10:00 AM ESTCivilization V
A game that has plagued my testing over the past twelve months is Civilization V. Being on the older 12.3 Catalyst drivers were somewhat of a nightmare, giving no scaling, and as a result I dropped it from my test suite after only a couple of reviews. With the later drivers used for this review, the situation has improved but only slightly, as you will see below. Civilization V seems to run into a scaling bottleneck very early on, and any additional GPU allocation only causes worse performance.
Our Civilization V testing uses Ryan’s GPU benchmark test all wrapped up in a neat batch file. We test at 1440p, and report the average frame rate of a 5 minute test.
One 7970
Civilization V is the first game where we see a gap when comparing processor families. A big part of what makes Civ5 perform at the best rates seems to be PCIe 3.0, followed by CPU performance – our PCIe 2.0 Intel processors are a little behind the PCIe 3.0 models. By virtue of not having a PCIe 3.0 AMD motherboard in for testing, the bad rap falls on AMD until PCIe 3.0 becomes part of their main game.
Two 7970s
The power of PCIe 3.0 is more apparent with two 7970 GPUs, however it is worth noting that only processors such as the i5-2500K and above have actually improved their performance with the second GPU. Everything else stays relatively similar.
Three 7970s
More cores and PCIe 3.0 are winners here, but no GPU configuration has scaled above two GPUs.
Four 7970s
Again, no scaling.
One 580
While the top end Intel processors again take the lead, an interesting point is that now we have all PCIe 2.0 values for comparison, the non-hyper threaded 2500K takes the top spot, 10% higher than the FX-8350.
Two 580s
We have another Intel/AMD split, by virtue of the fact that none of the AMD processors scaled above the first GPU. On the Intel side, you need at least an i5-2500K to see scaling, similar to what we saw with the 7970s.
Civilization V conclusion
Intel processors are the clear winner here, though not one stands out over the other. Having PCIe 3.0 seems to be the positive point for Civilization V, but in most cases scaling is still out of the window unless you have a monster machine under your belt.
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IanCutress - Wednesday, May 8, 2013 - link
I have those three CPUs in the 'ones I want for the next update'. I'm of course going to try and get them :)Ian
boulard83 - Thursday, May 9, 2013 - link
Thanks for the answer Ian ! :)whyso - Wednesday, May 8, 2013 - link
A8 for single gpu gaming with a 7970? Really? Just because your limited run of 4 games did not show anything wrong with the a8 does not mean that the a8 is going to perform properly with other games. Play Hitman with it and a 7970 or multiplayer BF3, then see if you are still going to recommend the a8.HalloweenJack - Wednesday, May 8, 2013 - link
anand have run BF3 with it and its perfectly fine.whyso - Wednesday, May 8, 2013 - link
Multiplayer?Spunjji - Wednesday, May 8, 2013 - link
What's with all the people in here who don't understand statistics?! You can't do scientifically rigorous multiplayer testing and produce useful results. The time required alone to test... the mind boggles.airmantharp - Wednesday, May 8, 2013 - link
Keep in mind that the article's title doesn't start with 'Statistical Analysis of...', but rather 'Choosing a...'.That's important. While you can't 'properly' benchmark multiplayer games, you can make reasonable inferences and use them to support your conclusions. The reality being exposed here is that Ian's benchmarks are really only useful for choosing a CPU for single-player games, not that there's a damn thing wrong with that.
However, it's not unreasonable for people to point out that the gaming situations requiring real CPU power to maintain playability are not covered in a 'Choosing a Gaming CPU' article.
felang - Wednesday, May 8, 2013 - link
+ 1,000,000frozen ox - Thursday, May 9, 2013 - link
In a multiplayer situation, you'll likely get similar ratios of performance, just lower average FPS. It's pretty easy to assume an X2 or i3 or other dual core is not going to hold up well, as these results support. But how in the hell are you supposed to have a baseline to compare systems in a multiplayer scenario? Do you have any idea what a cluster fuck that would be, even to compare just one game across only two systems, let alone as many as this review has?This review helps CPU buyers because they can look at these results, and multi-GPU setups, and see where the bottleneck will occur first. That doesn't mean there won't be more bottlenecks, but at least you can see which part of your system you should upgrade first.
felang - Wednesday, May 8, 2013 - link
Agree 100%. 4 games is not enough to reach a conclusion (dated ones at that). An A8 definitely is not going to cut it in more demanding games.