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tesstme

macrumors newbie
Original poster
Jun 15, 2016
3
0
Hello,

recently I got a 4,1 mac pro, that I wanted also to use for games. I installed windows from scratch (needed to create disk from an iso and boot from it). After that I installed 5.0.5621 Bootcamp drivers. Now i wanted to insert the new graphics card (MSI NVidia 960gtx). But before opening the packaging I wanted to ask some questions, since I didn't got any clear answers by reading the forum for several days.

1. Will the 960gtx run in PCIe 2.0? Some threads say no, some threads say you need to flash etc.
2. Can I reuse the power cable from 8800gt for powering the 960gtx?
 

Draeconis

macrumors 6502a
May 6, 2008
974
265
Hello,

recently I got a 4,1 mac pro, that I wanted also to use for games. I installed windows from scratch (needed to create disk from an iso and boot from it). After that I installed 5.0.5621 Bootcamp drivers. Now i wanted to insert the new graphics card (MSI NVidia 960gtx). But before opening the packaging I wanted to ask some questions, since I didn't got any clear answers by reading the forum for several days.

1. Will the 960gtx run in PCIe 2.0? Some threads say no, some threads say you need to flash etc.
2. Can I reuse the power cable from 8800gt for powering the 960gtx?

1. Not that I know of, no. Flashing is for boot screens and EFI menu, for PCIe 2.0 you'd need a resistor mod. Only MVC offers this currently, for a price.

2. The TDP of your card is about 150w (reference is 120, but your version has 1x8-pin rather than a 6-pin), so you'll need both 6-pin traces from your motherboard. If you don't have two cables, look online for an additional 6-pin male to male power cable.
 
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tesstme

macrumors newbie
Original poster
Jun 15, 2016
3
0
Thanks for fast answer Draeconis! I just wondered in it makes Sence to mod the card, since I read that the 1.1 is about 2% slower in fps for 2k gaming. Is it true?
 
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Draeconis

macrumors 6502a
May 6, 2008
974
265
Thanks for fast answer Draeconis! I just wondered in it makes Sence to mod the card, since I read that the 1.1 is about 2% slower in fps for 2k gaming. Is it true?

Doing the resistor mod (from what I can tell) is an in-depth, risky, specialist electronics task. If you don't have the correct tools, experience, and willingness to risk killing your GPU, I'd avoid attempting it on your own.

That MSI card you have is almost certainly not reference either, so even if someone pointed you in the right direction with a stock MVC card, it wouldn't necessarily be the same resistor mod with yours.

All that for 2% or so, not sure if it's worth it really.

What is love to know, is what the impact is from something far more demanding, like the 1080. I wonder if PCIe 1.1 speeds bottleneck that.
 
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Fl0r!an

macrumors 6502a
Aug 14, 2007
909
530
Nvidia cards use a soft strap as PCIE 2.0 switch, so ne soldering required. The necessary change isn't public though.
 
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h9826790

macrumors P6
Apr 3, 2014
15,199
7,516
Hong Kong
Resistor mod is for AMD card, NOT for Nvidia card. Nvidia need Mac EFI to enable PCIe 2.0 in Windows, not resistor mod.

Power cable is just a cable. All you need is match the pin number, if both card has 6pin input, than your original cable is fine. If one card has 6pin, the other card has 8pin, then you better get a correct cable.
 
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tesstme

macrumors newbie
Original poster
Jun 15, 2016
3
0
Resistor mod is for AMD card, NOT for Nvidia card. Nvidia need Mac EFI to enable PCIe 2.0 in Windows, not resistor mod.

Power cable is just a cable. All you need is match the pin number, if both card has 6pin input, than your original cable is fine. If one card has 6pin, the other card has 8pin, then you better get a correct cable.
Thanks. I installed it and it works ok, but as expected in pcie 1.1 .
Is the Mac epi for Nvidia some kind of "secret" that only macvideocards have?
 
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Squuiid

macrumors 68000
Oct 31, 2006
1,718
1,218
Thanks. I installed it and it works ok, but as expected in pcie 1.1 .
Is the Mac efi for Nvidia some kind of "secret" that only macvideocards have?
MVC (and Netkas) put in a lot of work to create the EFI roms, not a secret necessarily but they charge for that work.
I wouldn't worry about PCIe 1.1 vs 2.0 with a GTX960. You will see little if any performance gain from 2.0 on that card.
 
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