- Joined
- Apr 11, 2014
- Messages
- 204
- Motherboard
- Asus ProArt Z790-CREATOR WIFI
- CPU
- i9-13900KF
- Graphics
- RX 6900 XT
- Mac
You're asking too much from Appleif so how (block diagram please!).
You're asking too much from Appleif so how (block diagram please!).
:facepalm: Just click and search, stup!d!No, but I found the article very unclear as to lanes are actually handled. There's no obvious PLX chip on the motherboard—which would be the most appropriate solution—or are the lanes actually shared, and if so how (block diagram please!).
Hopefully, we'll get the answer once the Mac Pro is released and in the hand of reviewers.
There is indeed a PLX switch. Two, actually.All slots are connected through a PCI Express switch on the Mac Pro main logic board. PCI Express switch bandwidth is automatically configured through pool allocations. You can use the Expansion Slot Utility to manually configure pool allocations.
2,25:1 oversubscription on die0 is actually not too bad.They have two big PCIe switches and are hanging everything off of them.
From the device tree:
8x Gen4 lanes on die 0, switched:
- x1 to USB internal
- x2 to SATA internal
- x4 to I/O card (USB, probably single lane connected)
- x8 to slot6
- x1 to LAN1
- x1 to LAN2
- x1 to WiFi/BT
16x Gen4 lanes on die 1, switched:
Assuming storage is 8 lanes on die0 (can't see the storage config in the device tree, but given the downstream port counts I hope the config is 8x/8x split on die0 and 16x for general purpose PCIe on die1).
- x16 to slot1
- x16 to slot2
- x8 to slot3
- x8 to slot4
- x8 to slot5
So basically 5 of the slots including both x16 ones are bottlenecked into a single x16 gen4 channel. Boo.
As I suspected, it's a last minute, put together product. Considering the performance between Mac Studio and Mac Pro are identical there is no way in hell anyone can justify $3k premium on Mac Pro.There is indeed a PLX switch. Two, actually.
FYI the 2023 Mac Pro has just been benchmarked - and it doesn't look good...well, not against hackintoshes anyway:
View attachment 567806
Geekbench 5 or 6 is not a reliable benchmark. See on Cinebench R23 ; i9-13900K is more faster than any new Silicon MacPro. In real render apps of course. We dont buy i9 or m2 ultra for browsing net or use excell )What's wrong with those scores?
When I searched "13900K macOS", I got:
View attachment 567809
Also, there are things that can be done on Apple Silicon in macOS that can't be done on Intel based systems like Apple Game Porting Toolkit. Plus, we know that the M2 Ultra will continue to receive macOS updates longer than any Intel system will.