• We've upgraded our forums. Please post any issues/requests in this thread.

7870 Overclocking


New Member
Apr 20, 2008
637 (0.18/day)
System Name Tahiti Treat
Processor i7 4770K @ 4500MHz
Motherboard Asus Maximus VI Hero
Cooling Custom H20
Memory Patriot Viper 8GB @ 1866MHz
Video Card(s) 2X Sapphire 7870XT (Tahiti Core) @ 1150/1500 CrossFire
Storage 2 x Intel 120GB 520 Series SSD Raid0 # 2x Seagate 1TB Raid0 # 1 WD 2TB EARS
Display(s) 3 x 22" Eyefinity
Case Cosmos S Custom
Audio Device(s) Asus X-FI
Power Supply Corsair AX860i
Software Win7 64Bit Ultimate
Benchmark Scores http://www.3dmark.com/3dm11/6848547
I have a pair of Sapphire 7870's

Currently there on air and looking to overclock them to see what they can do.
Have no desire to kill them so what would be my MAX SAFE volt increase?
Oct 29, 2012
1,888 (1.01/day)
System Name TITAN Slayer / CPUCannon / MassFX
Processor i7 5960X @ 4.6Ghz / i7 3960x @5.0Ghz / FX6350 @ 4.?Ghz
Motherboard Rampage V Extreme / Rampage IV Extreme / MSI 970 Gaming
Cooling Phanteks PHTC14PE 2.5K 145mm TRs / Custom waterloop / Phanteks PHTC14PE + 3K 140mm Noctuas
Memory Crucial 2666 11-13-13-25 1.45V / G.skill RipjawsX 2400 10-12-12-34 1.7V / Crucial 2133 9-9-9-27 1.7V
Video Card(s) 3 Fury X in CF / R9 Fury 3840 cores 1145/570 1.3V / Nothing ATM
Storage 500GB Crucial SSD and 3TB WD Black / WD 1TB Black(OS) + WD 3TB Green / WD 1TB Blue
Display(s) LG 29UM67 80Hz/Asus mx299q 2560x1080 @ 84Hz / Asus VX239 1920x1080 @60hz
Case Dismatech easy v3.0 / Xigmatek Alfar (Open side panel)
Audio Device(s) M-audio M-track / realtek ALC 1150
Power Supply EVGA G2 1600W / CoolerMaster V1000 / Seasonic 620 M12-II
Mouse Mouse in review process/Razer Naga Epic 2011/Razer Naga 2014
Keyboard Keyboard in review process / Razer Blackwidow Ultimate 2014/Razer Blackwidow Ultimate 2011
Software Windows 7 Ultimate / Windows 7 ultimate / Windows 7 ultimate
Benchmark Scores cinebench 15.41 3960x @ 5.3ghz Wprime32m 3.352 3960x @ 5.25ghz Super PI 32m: 6m 42s 472ms @5.25ghz
it should be the same as for any other 7xxx series cards as they are all on the same manufacture process so 1.25v though if Sapphire is anything to judge by then 1.35v should be just fine but I very much doubt that all GPUs will survive that as Sapphire uses it on there Toxic highly binned cards. Also most reports say that anything over 1.3v doesn't help overclocking so 1.25v is probably ideal if you can cool it. Also check you ASIC quality low (<60)is for extreme cooling(LN2) and takes a lot of voltage to kill and overclock over 1.4 to fry instantly. If you have high(>70) quality the go with less voltage like 1.2v.