PC Crashing In CoP Dynamis...

About 5 months ago I installed a Sapphire Radeon HD 6950 for my graphics card, but ever since then, i've just had this horrible continuous crashing where my PC just freezes up, then reboots itself...

I've come to the conclusion that my graphics card is probably too powerful for XI (as it has crashed several times outside of dynamis), but I wonder if there could be another underlying issue. Any ideas?

Drivers, too old or too new. there was a special beta patch for certain nvidia card awhile back, just for ffxi. They have since fixed it. I would go through all the release notes for all the drivers.

Also, if your vid card requires an extra 4 pin molex connector, make sure you power supply has enough juice to handle it. That will cause it to crash too.

I should also add that it only seems to crash with FFXI. I've played Diablo 3 at its highest graphics settings, TF2 with highest graphic settings, etc.

I do know that the release notes on SE's site doesn't list my GPU, which is one reason for its instability with this game

As for the PSU, I've got an OCZ ModXTream-Pro with a max of 700 watts installed, so It should be more than enough to handle the GPU.

Take a look at the event log under admin tools look at the event and the dll that caused the crash.

You said in your first post it crashes quite a bit, and on your second post, only within FFXI. The first thing to look at would be drivers.
ATI cards can also tend to run a bit hot.
So the things I would look into would be the following.

Remnants of older graphic card drivers; you installed this five months ago, what was in there before?
You could have some corrupted .dll files related to that.
Windows itself gets very glitchy when swapping out GPU's from different driver versions, or manufactures. You should check into a registry cleaner to see if it can find any errors related to this.

Heat, since you said you can play diablo 3 and Tf2 on highest settings, heat is most likely not the culprit here.
Either way, older directX8 games can run very oddly on newer GPUs.
Monitor the temps just to make sure nothing odd is going on.

Last would be finding the right set of drivers.
FFXI is very picky with which drivers are used, even if you have updated to the latest drivers, they may not be the best for ffxi. Check into removing, and installing a slightly older driver version.

Also, if you could do a full hardware diagnostic on your system, that would great. You can find out all sorts of information about what might be going on. From bad RAM, to corrupted sectors on your HDD.

verify the files of ffxi if its that specific to where you crash.


but otherwsie with crashin its always a good diea to run some isolations test and diagnsotic

run memtest86+ to test your ram
run the hdd diagnostic software form the hdd producer

some information regarding your pc setup would help in investigation what could be the culprit

ATI cards do not run hotter than nVidia, and vice versa because every new generation changes that fact and usually they're relatively close anyway.

Registry cleaners don't do ***for your computer and most of the time they're either malware or ineffective. Use a driver cleaner like this one from guru3d

FFXI is mostly picky with new-ish nvidia cards and multiple gpu setups. Generally, single ATI cards work fine with FFXI.

edit:
Forgot to mention that I use a radeon hd6850 with 12.3 drivers and it works fine.

lol, ccleaner is pretty amazing, and it's helped in a pinch or two, shouldn't discredit them all like that.

And statistically, ATI on average do run hotter, at least in mobile...