I decided to take a risk and I bought the Galaxy 780 HOF. I'm aware of the VRM issue, but I liked the way the card looks (and the price), and I wanted to give it a shot.
Here's some crappy iPhone pictures. I managed to get a good picture of the IC that has been burning on people's boards, if anybody wants to read the markings on it:
Things to note:
- This thing seriously overclocks really well. I've managed to get it stable at over 1300 MHz on 1.2V. I'm interested to see how high it could get with extra voltage.
- I managed to get it over 1300 MHz without the 'Hyper Boost' button enabled. Some reviewers were saying that they could only get the voltage to apply if HB was on, but I'm able to ramp up the voltage to 1.2 without HB. Their Xtreme Tuner application is kind of terrible and buggy, but putting the voltage all the way to the right gives 1.162 V actual, and then an "overvoltage" setting of +38 mV puts the actual voltage at exactly 1.2 V. The application doesn't show those numbers when you're editing values, so you just have to look at the actual readings from the GPU.
- I've noticed the downclocking problem. It only happens with certain applications. For instance, it doesn't downclock for BF4 or Heaven benchmark. But if I just run Furmark, it will downclock to around 600 MHz. Running Furmark and Heaven simultaneously makes it ramp up again, and it won't downclock. So it seems to not be a temperature thing, but an inability for the card to accurately predict when load is happening.
- One last thing; the voltage (VDDC) in GPU-Z is different from the GPU voltage monitor in Xtreme Tuner. Which one of these is more accurate?
Overall I think it's a great card that overclocks well. I'll have to wait and see how my card holds up as far as the burning IC goes, fingers crossed it stays good. I also hope Galaxy fixes the downclocking issue and the innacurate readings in their Xtreme Tuner software. Going forward I'm keeping the card at 1267 MHz
core and 3110 MHz
clock @ 1.162 V to hopefully avoid putting too much strain on that IC. I'm happy with nearly 1300 MHz for games, below 1.2 V, with a sane fan profile (Hyper Boost disabled).
I think this card would be EXCEPTIONAL with a water block. Put this thing under water, and there would be no negative to keeping Hyper Boost enabled (no ridiculous fan noise) and you could really take the overclock farther. When EK releases the block for this thing, I'd be willing to try it down the road.Edited by Heuristic - 11/6/13 at 8:07am