"specs in your sig are really up to date ?" Yes
"You can play smoothly at a 4k resolution in the Rift with a single graphics card ?"
I didn't say smoothly, said minimal judder, I've seen it running at 75fps at a nav beacon but with the odd dip to below that (minimal judder). In stations (didn't test rings) I was getting at low as 40fps.
"I thought two gpus would be mandatory even for 1440 downsampling with current hardware..."
Depends, playing last night at 1440p with everything on low on a single OC'd 980 seemed OK, still get dips below 75fps in certain circumstances.
"what framerate are you actually getting ?"
It varies, seen around 75fps and as low as 38fps.
"how much of an improvement was the new SDK for you ?"
Seems a bit of an overall improvement, stations and rings still an issue but an improvement.
"Were you able to play in 4k downsampled before ?"
On the monitor yes, ran very well but it's a 60hz monitor so I wasn't too bothered if the frame dipped to 40fps. I'd not tried it on the rift, just thought I'd give it a go last night, thought it would be like a slide show, wasn't as bad as what I'd thought it would be, I think though that SLI if they sort the latency issue will be the way to go.