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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Achaios - Friday, May 10, 2013 - link
@Ian Cutress: Hello Ian, please get a hold on a Quad Core Intel Core 2 CPU (q9540, q9550, q9650, qx9650, qx9770) and include it in your testing. I don't know where you get that "many people are still on Core 2 Duos" maybe you have seen some sort of market research? I still use a QX 9650 for gaming (WoW and SW:TOR-MMO's) and I am very happy with its performance. It would be nice to see how the high-end Core 2 CPUs measure up against modern CPUs.Andy_1 - Friday, May 10, 2013 - link
What a great Article, As I am in the process of making my mind up what to buy in the next two months this answers so many of my questions. Thank you! My main unanswered question some how seemed to get missed OR did I not read correctly??QThe results on the games show the 2 CPU config as scoring zero! is that because the wouldn't run the software on the rig or what?
ajlueke - Friday, May 10, 2013 - link
Great article. For those of us still gaming at 1080p with single GPU set ups, it is nice to know that it doesn't really matter if I spend a little less on the CPU and divert those funds toward a higher end GPU.Gamer4Life63 - Friday, May 10, 2013 - link
First, well done piece with lots of great info. Now then I would love to see this same kind of look done at 1080 resolutions with a mid range card like a 7870 or 7850. Would also love to see some other games added to the mix like a modern MMO or Skyrim that is a bit harder on the CPU.SurrenderMonkey - Friday, May 10, 2013 - link
Yes, Intel has great engineers not to forget the business gurus. Intel did a great job on Larrabee, choose(?) not to be in the Nextgen consoles and it will be jam tomorrow in the tablet and smartphone market. In April Intel reported a downturn of 25% in profits which it attributed to a decline on the PC market. As Anandtech has just shown the GPU is where the money is at, the CPU is a passenger and time to replace is extending. Intel makes good processors but it is also a one trick pony who has failed to move with the times.MarcVenice - Friday, May 10, 2013 - link
You thought of some many things to consider, yet when you say: We know what's missing, you forgot so many things. I didn't read all the comments so excuse me if someone already mentioned it. But what's missing is several games. Crysis 3 for example, or Far Cry 3.You mentioned that 1440p is a niche (it's 2560x1440 btw, 1440p isn't technically a resolution). So why didn't you test at 1920x1080, not only are games more prone to being cpu-limited, but games like Crysis 3 or Far Cry 3 are actually more demanding then games like DiRT 3.
Reason I mention this, is that I've found there to be a rather big difference between a X4 970 and a 3960X in those games, at ultra settings in Crysis 3 and FC3, with a GTX 660, 670 and 680. I know Anandtech doesn't report minimum's, but if you take the time to do as many runs as you did, you can scientifically establish that the minimum fps is also greatly affected by slower cpu's.
Reason I respond after not having done so in years, is that I found your suggestion to pare a 5600K with a high-end gpu to be disputable, and that's me being mild. Especially since you more or less went and said that 'other' websites or testing didn't do their testing properly.
OwnedKThxBye - Monday, May 13, 2013 - link
I agree 100% MarcVenice.The recommendation also doesn't take into consideration the upgrade path of the PC. If you were to follow this suggestion, the probability of having to do a full CPU and motherboard upgrade instead of just the GPU when you next need to upgrade is going to be significantly higher. Most people don't want to do a full system upgrade after 2-3 years because they are CPU limited on the new title they want to play. I say spend the extra $100-$150 on a better CPU and potentially make the PC last another two years.
lesherm - Friday, May 10, 2013 - link
Ian, this is real research and journalism. This kind of in-depth reporting on hardware is exactly what keeps me coming back to anandtech, year after year. Your efforts are appreciated!TheQweaker - Saturday, May 11, 2013 - link
I agree with this.-- The Qweaker.
Animebando - Friday, May 10, 2013 - link
I would love to see this kind of write-up that covers surround/eyefinity resolutions. I've been fairly impressed with how my 7950 handles games across three monitors, and I've been an nVidia fan for years.