Picked up a ZOTAC GeForce GTX 980 AMP! Extreme Edition yesterday and was so exited to test this card that looked so good on paper.
Two 8-pin power connectors and a couple of LN2 switches made me hopeful that this card would give me some extra vcore to OC higher than the ref cards.
Boy was I wrong, first of all this card doesn't work with either MSI Afterburner nor EVGA PercisionX so you have to use the FireStorm (Rev 2) to adjust speeds, TP and vcore(this is kind of DRM isn't it?). The card also have a USB connector to connect to your motherboard not sure why as I couldn't see any difference in OC'ing with or without it.
This card comes with a high base-clock at 1393 MHz boost so I hoped it would go much higher but I was very disappointed. First of all on the MSI GTX 980 Gamer card I tested the vcore max was 1,25V measured with DMM on this ZOTAC GeForce GTX 980 AMP! Extreme Edition it was 1,225V and that was all I could get out of it.
So how high could I push this card? Max OC on core was 1503 MHz and then it only could pass Firestrike half of the time, memory went to ~2000 MHz. So this "Extreme" GTX 980 wasn't extreme at all and is going back today after reading this review.Do Not Buy Zotac's GTX 980 Extreme - We Get Higher Overclocks on Reference | Benchmark
Read more at http://www.gamersnexus.nethttp//www.gamersnexus.net/hwreviews/1666-zotac-gtx-980-extreme-benchmark-review-overclocking?showall=1#lTBZCax230kmWPsl.99