2020. 2. 9. 01:54ㆍ카테고리 없음
- Computers Managing PCI-express slots in Mac Pros. Mac Pro computers come with three unused PCI-express expansion slots for adding extra graphics cards, RAID controllers, multimedia, and I/O.
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Click to expand.Since GTX 680 is not really an Apple card in the same way that the 5770, 5870 cards are, then the PCI fan may exhibit some unusual fluctuations when the card is in slot 1. For some, the fluctuations appear to be a non-issue, as they are not very dramatic and not even audible.
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For others, the fanspeed can be quite wild and annoying. It seems to vary for some reason. Look at this thread: Using slot 2, as Mango says, seems to 'cure' this behavior for some people. My GTX 650 (PC card) is in slot 2 and PCI fan runs at standard 800 rpms. In slot 1 the PCI fan constantly changed speed but it was not noticable.
A more powerful card may or may not produce more dramatic fluctuations. The thing to do is install in Slot 1 and monitor the fan speeds with iStat. If the Mac Pro's PCI fan revs up like mad to the point that it is annoying, then try it in slot 2.
And please report your experiences. We'd love to know how it works out. You can use either SLOT, I prefer Slot 1, since it's double wide and won't block any other slots.
As for the PCI-E Fan and PSU fan spinning up with non-apple cards, this still happens in SLOT 2, just not as noticeable as SLOT 1. Also when using SLOT 2 sometimes the load trick to return the fans to normal won't work.
The Load trick works by loading the graphics card up after a cold boot to make the fans return to normal speeds. I use 'OpenGL Extensions Viewer' available from the Mac App Store, then hit the benchmark test, which loads stresses the video card, and causes the fan to return to normal speed. However doing this with a video card in SLOT 2 still won't return the fans to normal speeds, it only works if the card is installed in SLOT 1.
My suggestion, put the video card in SLOT 1. I've looked into this issue extensively. It has to do with how the Mac Pro throttles the system fans. If you install the card into slot 1, your system fans MAY run faster due to a glitch in the SMC firmware. If you stress out the GPU sufficiently, it will force the SMC to re-evaluate the fan speeds and those speeds will then drop to normal (until you shut down your system). This is caused by the way the Mac Pro gauges the fan speeds in response to the current the card is drawing.
I believe the auxiliary power cables are only taken into consideration when the card is placed in slot 1, therefore if you place the card in slot 2- the Mac Pro effectively 'ignores' the current draw through the aux power cables, and this tends to bypass the whole fan issue (but only slightly, your fans will still run a bit faster then they should- but not a lot). So, really, there is no technical reason as to why you have to use slot 2. I'd say try slot 1 first. If your fans start behaving weirdly (you'll know because the system will definitely sound louder then normal), move the card to slot 2.
I run a PC EVGA GTX 570 superclocked vid card, unflashed. Powered by the logic board for now. Soon I will be installing a jucebox optical drive power supply and upgrading the graphics card to a 770.
I keep my GPU in slot 1 where the original oem card would be. Perhaps this is why my front PCI fan runs at 1800 rpms consistently in OSX and windows, when I have it plugged in anyways. (I keep that fan unplugged because my gpu's fan keeps its self cooled just fine. I keep the front cpu fan plugged in of course. You can manually run either or fan in the front by unplugging which fan you dont want on the front fan 'sled/assembly').