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What resolution?
If you're talking about getting it to work at 144hz (regardless of Freesync), it's most likely the cable. Some 6950s also don't output dual-link DVI on both DVI ports, have you tried both?
If it were me, I would be using the DP/mini-DP anyway since dual-link DVI is close to...
Kinda similar situation as OP, will be running a 1080 into the sunset with this 2600k system, which is quite similar to your overall performance balance.
Sandy Bridge forever!
UPDATE 04-24: I lied, I'm fucking weak haha, dropped in a 2070 but still on Sandy
I don't normally like such heavy looking cards, but all that clean, shiny metal does make it look pretty damn appealing. I should leave this thread before it does bad things to my wallet.
I've found coil whine to happen most often on cards that draw a lot of power (200W and above). Though my only recent tests took place over the past couple of years -- 900s and 1070s/1080s; the last card I owned that had serious whine was the 7970). Just a data point from me.
I wish I could still say the same for myself. I swore off used, but then I saw a good deal and had a good feel from the seller after seeing where they live (i.e. not a miner).
Prices can stay high since nVidia just priced the existing previous gen cards into the current lineup.
Thankfully, it's a Seasonic so even it fails it won't quite blow up (I only hear of really poor quality PSUs taking other components with them when they die).
This is pretty much why you also never see prices drop when nvidia cards are EOL. Control over pricing.
They would sooner set the cards on fire than see them sell for a discounted price.
If you're genuinely wondering (...) why people are upset when Y card is the same as X card from years ago, it's because it took them years to do it.
We're being told to pay handsomely for the privilege of getting more for less.
Meanwhile, they're playing a shell game on us to raise prices at...