My Computer is a Mac Pro 2009, 2.66 Quad core, 32G RAM, boot from a Samsung 840 Evo 1T SSD mount on the Sonnet Tempo SSD, with another 7T HD in software RAID 0.
The original 4870 is just good enough to drive the 27' Apple cinema display. Even though it can still play games like SIMS 3 or X-plane, but obviously must run in full speed, that makes the fan become very very noisy.
I order the 7950 via this webpage, use the cheapest DHL option. The card deliver to my home in 3 days, by considering I am living in East Asia, not extremely fast, but totally acceptable.
The user manual says must install the driver before install the card (which contradict to their website info). So, I try to do so. However, when I try to run the CD, it says my OS (10.9.2) is not required to install any driver. So, I shut down the computer and start installing the hardware.
The instruction in the manual is very easy to follow. I remove the old 4870 from slot 1, change the power cable, install the new 7950, and then connect the power cable.
The only thing confuse me a bit is the firmware switch. The point 1 in the manual is talking about the MAC mode, but the number on the switch is actually number 2. The manual says the card's default setting should be in MAC mode, however, it is not. I think point 1 in the manual is explaining the switch 1 position, also, it's says MAC mode is the default mode. So, I didn't change it.
I connect the the monitor via the mini-display port, switch on the computer, with nothing on the screen.
So, I read the manual again, change the firmware switch position to the RHS as the manual said, switch on the computer again. Then everything work like a charm.
The boot screen is lovely, I can choose any boot up partition by holding the option key.
After the upgrade, I can no longer use atMonitor to monitor the VRAM usage. Before the upgrade, Safari can use up to 98% of the 512mb VRAM on 4870. But now, the reading always stay at 0%. I believe it's a software problem, since atMonitor is not working very well after OSX 10.8 for monitoring the graphic cards parameter.
I try the X-plane again, switch every render option to the max, the game can run, but not very smooth. Which is already a huge jump from the 4870, because the 4870 will simply give up by showing a black screen if I turn everything to max. But once I switch the render option to "high" rather then "very high" (but still leave the aircraft texture option to very high), the game run smoothly. For me, I am very happy with this performance. The fan noise is far much lower than the 4870 in high performance, but I can notice that the fan speed keep changing when I use Safari. Not consider noisy at all, just noticeable.
On the system info page about PCI cards, it indicates the followings...
Name: ATY,HamachiParent Type: ATY,HamachiParent Driver Installed: No
I have no idea what this mean, it seems some driver is missing. I can't get any answer from the internet yet, but I've seen some other post on other forum having exactly the same question. Will try to get an official answer from Sapphire. Anyway, this card perform well without any obvious problem.
I would recommend this item to a friend!