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HiCanIPetYourCat t1_j8dcytw wrote

I had fast DDR4 in the old rig so I’m pretty sure it was CPU related. I don’t even have XMP on in this new rig, it runs everything maxed out in 4k at 120 fps so I haven’t bothered.


YouJustSaidButFuck t1_j8dfen1 wrote

Was the PCIE gen the same?

Gen 5 has 2x the bandwidth as gen 4. Rather than memory latency, bandwidth is usually the chokepoint for most memory related things.


CoderDevo t1_j8dkgha wrote

This is it. The 4090 can use those faster PCIe lanes.

Edit: I concede that this is not it. Looked at others' demos and none showed more that a 5% improvement with a 4090 on PCIE 3 vs. 4.


Backlit_keys t1_j8edtrs wrote

The 4090 actually only supports PCIE Gen 4.0, so those getting fancy PCIE 5.0 motherboards will not gain any performance over the GPU. That, and I believe (really not sure on this) 4090 is not capable of saturating the 4.0 bandwidth. OP could’ve had his 5600X in a PCIE 3.0 build, though.