If the you're not GPU limited when not recording, then no.
However, recording at a higher resolution both increases the CPU workload and the bandwidth required. If you're hitting CPU limits (check load using task manager/resource monitor), try decreasing the resolution you record at (which doesn't have to be the same resolution you play at).
If your HDD can't keep up, but you have CPU resources to spare, set the rate control to single pass - rate factor based and experiment with which values your CPU can keep up.
The recording won't be lossless anymore, which is not ideal if you plan on further editing the footage, but that's one way to do it.
Edit: Well, if space is not an issue and you're CPU limited with x264 and these settings, you could try using something like
HuffYUV. It's pretty old by now and not very efficient, but is very very lightweight. I haven't used it in forever, but that might be something else to try.