The Bottom Line
We have put forth a great effort to get to the bottom of the PCIe 2.0 versus PCIe 3.0 debate. We put a lot of time into testing performance and verifying that our data is accurate. Except for a couple of specific scenarios, most of the performance advantage had under PCIe 3.0 was well under 10%. This actually falls in-line with the kind of performance advantages one might expect using n Ivy Bridge CPU clock-for-clock compared to a Sandy Bridge CPU. The IPC can affect performance by as much as 4-7% in favor of Ivy Bridge easily. As you noticed, most of our data when we experienced an improvement on the Ivy Bridge system was in this range of improvements. There were a few specific cases of 11% in The Witcher 2 in one test, and 19% in Batman (for part of the game only) and 14% when we cranked up the settings to unplayable levels in Max Payne 3. For the most part, at the real-world highest playable settings we found playable, all performance advantages were under 10%.
With real-world gameplay performance advantages under 10% it doesn't change the actual gameplay experience. It in no way allows us to improve in-game quality settings nor does it give us any advantages over the PCIe 2.0 system. As we've stated previously in this evaluation, the technical performance advantages are "benchmarkable" but not relating to the gameplay experience.
It is also very clear from our testing that the NVIDIA GeForce GTX 680 receives an overall higher percentage of improvements with Ivy Bridge than the Radeon HD 7970 does. It is possible that similar to our past CPU frequency testing, NVIDIA GeForce GTX 680 GPUs are simply more sensitive to CPU clock speed and IPC, especially when you scale these upwards. We've done testing in the past that also shows NVIDIA GPUs are more sensitive to CPU clock speed than AMD GPUs are as you scale those up to dual and triple-GPUs. Therefore, we are not shocked to find that one brand might benefit with a technology more than another. It is an interesting result that we didn't expect when we started testing.
So do not fret if you are on a Sandy Bridge PCI Express 2.0 system, you aren't missing out on a bunch of performance compared to an Ivy Bridge PCI Express 3.0 system. Most of our readers will likely benefit from higher CPU overclocks on Sandy Bridge anyway if you are truly pushing the CPU clock and this alone will likely negate any "advantages" from PCIe 3.0 or Ivy Bridge IPC when it comes to real-world gaming scenarios. PCIe 3.0 is a great evolution, one day it may actually support a better gameplay experience compared to PCIe 2.0, but that day is not today.
. I could care less about improvement in Excel, IE, Chrome. I do care about, GAMING! How much of an impact please? Sys/ specs in sig.
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