- Joined
- Jul 25, 2012
- Messages
- 38
- Motherboard
- Asus Prime X299 Deluxe
- CPU
- I9 7900X
- Graphics
- MSI GeForce GTX 1080 SEA HAWK EK X
So I upgraded to a i9 7900X and ran into the memory issue again. I’ll go through the motions of swapping out the aptio file again to fix it, but I just wanted to mention the issue might not be completely related to running out of pci lanes.I can already confirm this for you.
When I first bought my mainboard in August I bought the 7820X because I didn't see 2 more cores being worth another $500. On the train home I was reading the CPU specs and only then realised that the X299 chipset was basically handicapped by anything less than a 7900X due to insufficient PCIe lanes to enable many of the mainboard's features. This is a mjor issue with X299 and SkylakeX IMHO - I expect to see many unhappy customers who don't understand the relationship between CPU PCIe lanes and mainboard features. This issue is amplified by the Deluxe boards having so many on-board devices. I strongly advise using only i9 processors on the X299 boards to maximise available CPU-PCI bandwidth.
Technically it could be argued that even 44 PCI lanes aren't enough for all the stuff crammed into the Prime X299 Deluxe. This may be why Apple are sticking with Xeon-W on the iMac Pro - an extra 4 PCI lanes in addition to ECC memory support.
Needless to say I returned the i7 the next morning for an i9 7900X. Luckily it was still in its unopened box.