3495 Views 10 Replies Latest reply: Mar 28, 2008 10:07 PM by PierceCook
Put the Mac Pro into a slot configured for 16x.
You need to launch the Expansion Slot Utility
as it won't auto launch anymore (10.5.x bug?)
I use the PC Nvidia 8600 GTS and it is "comparable" or slightly better than the 2 yr old X1900.
Your 7300s do little and there is no type of bridge or SLI support. The one in the lower slot should be 16x and the top one set to 8x. Slot 2 by default is going to be 1x or 4x, I think 1x.
Very interesting. So, I'm a Mac Neophyte -- can you (or someone else) expand this for me a little? What is going wrong, and what are the steps I need to take to fix it? In particular, it seems you are suggesting that I fire up this Expansion Slot Utility and change some settings that will correct this problem.
A) Is that in fact what you mean?
B) Which settings, and to what values?
C) I wasn't expecting the 7300s to help, I just mentioned them in case their existence or positioning might be hurting. Does your final paragraph mean that I should move my x1900 to slot 1 to take advantage of the 16x (I dont' know what that number means, incidentally, but I assume bigger is better), or simply that I need to change the setting on the x1900's slot to also be 16x?
When you launch that utility, I think it will be more than obvious.
And yes, pull the 7300s and move the Radeon. I assume you have the auxiliary power cord connected between the card and the small plug.
16x = number of PCI Express lanes and bandwidth, and yes, higher numbers are better!
All you need is the X1900 in there for now. The only use for two 7300s is for 3-4 monitors. Or two 30" (the X1900 can drive two 30" displays or 23 and 30).
Okay, this looks like it's definitely the problem (1x vs. 16x slot, you were correct). But I cannot for the life of me find anything anywhere that tells me how to (physically speaking) safely extract a PCI card. The most helpful thing I've found is something to the effect of "pull the tab thingy to release the catch". What tab thingy, what catch? Everything relevant is UNDER THE VIDEO CARD! Gah.
Any advice (esp pointers to diagrams) would be helpful. There's a diagram in the x1900 kit, but it's not really clear what it's talking about, since, again, everything is obscured by the very card I want to remove.
Glad you got it working. Hey, at least now you have one less tab in the way for your next upgrade
If you're still watching this thread, would you mind posting what kind of framerates you're getting now with it in the 16x slot? I am just curious if it goes up linearly with 2x the interface speed, or if it's more modest. Have fun with it.
I'm seeing around 70 FPS with x1 sampling, FSGE turned on, and high (not quite max) settings at full 2560x resolution. Multi-sampling with FSGE kills the frame rate, but even then I'm seeing close to 30 FPS.
I went from a slot with 1 lane to a slot with 16, and I don't think I'm seeing a 16x speedup, so PCI lanes wasn't a complete bottleneck, but it was clearly a huge issue.
Message was edited by: traeki
I just upgraded to the new MBP with the 8600M GT vid card and it doing exactly what everyone else is complaining about. On COD2 at minimum settings I am getting 25 FPS. My IMac gets 150 FPS at high settings and it is running a 256mb card. Is there a fix for the 8600M or am I at the mercy of a crappy design or software issue?
Adding to the excitement - I've been getting framerate peaks around 200fps in Team Fortress 2.
Bioshock, COD4, and Supreme Commander w/ everything maxed at 1600x1200 and full anti-aliasing is a charm.
Crysis I have to run at 1280x1024, but with settings maxed and full anti-aliasing as well, runs great.