FYI for anyone else doing this type of build ... moving my GPU to PCIEX16_2 slot (because it no longer fits in PCIEX16_1 due to a poorly place motherboard display unit) means my water cooled front/rear 4090 GPU will only be able to run X8 and not X16.**
I "assumed" that a $1000 motherboard would:
Allow for full coverage water cooled GPUs to fit in PCIEX16_1 slot
Allow me to select which one of the two PCIEX16 slots to run at X16
Unfortunately that is NOT the case, the ONLY slot this Asus X670E Extreme motherboard can operate at X16 is PCIEX16_1 slot (regardless of M.2 configurations).* That does beg the question why Asus
falsely label the slot as PCIEX16_2 when it has no ability to run at X16 regardless of hardware configuration?This is clearly a motherboard limitation as the CPU PCIE lanes are sufficient to support.
nVidia 4090 GPU (16X) PCIEX16_1
M.2 4X via Chipset (4X)
M.2 4X via General Purpose PCIe (4X)
USB 3.0 PCIe card (4X) PCIEX4
All within lane spec usage ... however because I moved the GPU to PCIEX16_2 this is what I'm forced with:
nVidia 4090 GPU (8X) PCIEX16_2
M.2 4X via Chipset (4X)
M.2 4X via General Purpose PCIe (4X)
USB 3.0 PCIe card (4X) PCIEX16_1
Really not happy with ASUS right now ... maybe other manufacturers do the same?* ASUS does NOT permit me to set PCIEX16_2 to 16X and PCIEX16_1 to 4X - why??
I don't know exactly how much this has impacted performance?* I was able to improve TimeSpy score both CPU/GPU to 32379 and very good temps with peaks at 58C CPU and 47C GPU under full stressed loads (but sorta expect that from a dual loop with one loop on a custom vapor chiller).
Come on ASUS, you can do better than this.
Rob