Just tried 7970 crossfire and it is garbage. Constant BSOD's, freezing, driver's were a ***** to install. Selling 1 of the 7970 and I am gonna stick with 1. 



Kill Bill
(14 items) |
| CPU | Motherboard | Graphics | RAM |
|---|---|---|---|
| i5 2500k @ 5ghz 1.42v 24/7 | ASuS P8P67-Pro | Sapphire 7970 | 2x4GB Corsai Vengeance 1600mhz |
| Hard Drive | Optical Drive | OS | Monitor |
| 2x Crucial M4 64GB Raid-0 2x WD Caviar Blue Raid-0 | not in service | Vista 64Bit | Dell U2412M 1920x1200 IPS :) |
| Keyboard | Power | Case | Mouse |
| 9 Year old HP | Antec Truepower Quattro 1200w | Antec 1200 | Razer DeathAdder 3500DPI |
| Audio | |||
| Stock Intel Realtek | |||
| View all | |||
Kill Bill
(14 items) |
| CPU | Motherboard | Graphics | RAM |
|---|---|---|---|
| i5 2500k @ 5ghz 1.42v 24/7 | ASuS P8P67-Pro | Sapphire 7970 | 2x4GB Corsai Vengeance 1600mhz |
| Hard Drive | Optical Drive | OS | Monitor |
| 2x Crucial M4 64GB Raid-0 2x WD Caviar Blue Raid-0 | not in service | Vista 64Bit | Dell U2412M 1920x1200 IPS :) |
| Keyboard | Power | Case | Mouse |
| 9 Year old HP | Antec Truepower Quattro 1200w | Antec 1200 | Razer DeathAdder 3500DPI |
| Audio | |||
| Stock Intel Realtek | |||
| View all | |||
Uninstall current drivers then install the drivers supplied with the card in the Disc with both 7970s in the system.
Â
ケンジ
(16 items) |
| CPU | CPU | Motherboard | Graphics |
|---|---|---|---|
| i7-3960X | i7-980X | GA-X79-UD7 / GA-X58A-UD9 | 7970 + 465 |
| Graphics | RAM | RAM | Hard Drive |
| 2x 6990 + 580 | 16GB 2133 MHz | 24GB 2000 MHz | 120GB x 2 RAID0 |
| Hard Drive | Hard Drive | Cooling | Cooling |
| 120GB x 4 RAID0 | Raptor 300GB x 2 RAID0 | CPU-370 | CPU-370 |
| Cooling | Cooling | OS | Power |
| VID-AR699 | EK FB X58A-UD9 | Win 7 Ultimate x64 | 1500W / 1250W+1200W |
| View all | |||
ケンジ
(16 items) |
| CPU | CPU | Motherboard | Graphics |
|---|---|---|---|
| i7-3960X | i7-980X | GA-X79-UD7 / GA-X58A-UD9 | 7970 + 465 |
| Graphics | RAM | RAM | Hard Drive |
| 2x 6990 + 580 | 16GB 2133 MHz | 24GB 2000 MHz | 120GB x 2 RAID0 |
| Hard Drive | Hard Drive | Cooling | Cooling |
| 120GB x 4 RAID0 | Raptor 300GB x 2 RAID0 | CPU-370 | CPU-370 |
| Cooling | Cooling | OS | Power |
| VID-AR699 | EK FB X58A-UD9 | Win 7 Ultimate x64 | 1500W / 1250W+1200W |
| View all | |||


Kill Bill
(14 items) |
| CPU | Motherboard | Graphics | RAM |
|---|---|---|---|
| i5 2500k @ 5ghz 1.42v 24/7 | ASuS P8P67-Pro | Sapphire 7970 | 2x4GB Corsai Vengeance 1600mhz |
| Hard Drive | Optical Drive | OS | Monitor |
| 2x Crucial M4 64GB Raid-0 2x WD Caviar Blue Raid-0 | not in service | Vista 64Bit | Dell U2412M 1920x1200 IPS :) |
| Keyboard | Power | Case | Mouse |
| 9 Year old HP | Antec Truepower Quattro 1200w | Antec 1200 | Razer DeathAdder 3500DPI |
| Audio | |||
| Stock Intel Realtek | |||
| View all | |||
Kill Bill
(14 items) |
| CPU | Motherboard | Graphics | RAM |
|---|---|---|---|
| i5 2500k @ 5ghz 1.42v 24/7 | ASuS P8P67-Pro | Sapphire 7970 | 2x4GB Corsai Vengeance 1600mhz |
| Hard Drive | Optical Drive | OS | Monitor |
| 2x Crucial M4 64GB Raid-0 2x WD Caviar Blue Raid-0 | not in service | Vista 64Bit | Dell U2412M 1920x1200 IPS :) |
| Keyboard | Power | Case | Mouse |
| 9 Year old HP | Antec Truepower Quattro 1200w | Antec 1200 | Razer DeathAdder 3500DPI |
| Audio | |||
| Stock Intel Realtek | |||
| View all | |||
Hydrophillic
(14 items) |
| CPU | Motherboard | Graphics | RAM |
|---|---|---|---|
| Intel Core i5 2500K | Z68X-UD7-B3 | AMD Radeon HD 7900 Series | G.Skill RipJaw X 2x4Gb |
| RAM | Hard Drive | OS | Power |
| G. | Crucial M4, WD 750G Caviar Black | Win 7 64 | MaxRevo 1350W |
| Case | |||
| Bench atm | |||
| View all | |||
Hydrophillic
(14 items) |
| CPU | Motherboard | Graphics | RAM |
|---|---|---|---|
| Intel Core i5 2500K | Z68X-UD7-B3 | AMD Radeon HD 7900 Series | G.Skill RipJaw X 2x4Gb |
| RAM | Hard Drive | OS | Power |
| G. | Crucial M4, WD 750G Caviar Black | Win 7 64 | MaxRevo 1350W |
| Case | |||
| Bench atm | |||
| View all | |||
If your Windows updated to the latest including SP1 and related components, restore all your overclock to default. If it still crashes, run Memtest or boot with a single stick and try each of them.
Â
Make sure you run both 7970s @x8/x8 and remove all devices from PCI slots.
Â
Check PCIe power cables from PSU to the cards.
Â
There's no other reason it shouldd crash if each card works fine at its own.Â
Â
Â
Â
ケンジ
(16 items) |
| CPU | CPU | Motherboard | Graphics |
|---|---|---|---|
| i7-3960X | i7-980X | GA-X79-UD7 / GA-X58A-UD9 | 7970 + 465 |
| Graphics | RAM | RAM | Hard Drive |
| 2x 6990 + 580 | 16GB 2133 MHz | 24GB 2000 MHz | 120GB x 2 RAID0 |
| Hard Drive | Hard Drive | Cooling | Cooling |
| 120GB x 4 RAID0 | Raptor 300GB x 2 RAID0 | CPU-370 | CPU-370 |
| Cooling | Cooling | OS | Power |
| VID-AR699 | EK FB X58A-UD9 | Win 7 Ultimate x64 | 1500W / 1250W+1200W |
| View all | |||
ケンジ
(16 items) |
| CPU | CPU | Motherboard | Graphics |
|---|---|---|---|
| i7-3960X | i7-980X | GA-X79-UD7 / GA-X58A-UD9 | 7970 + 465 |
| Graphics | RAM | RAM | Hard Drive |
| 2x 6990 + 580 | 16GB 2133 MHz | 24GB 2000 MHz | 120GB x 2 RAID0 |
| Hard Drive | Hard Drive | Cooling | Cooling |
| 120GB x 4 RAID0 | Raptor 300GB x 2 RAID0 | CPU-370 | CPU-370 |
| Cooling | Cooling | OS | Power |
| VID-AR699 | EK FB X58A-UD9 | Win 7 Ultimate x64 | 1500W / 1250W+1200W |
| View all | |||

Kill Bill
(14 items) |
| CPU | Motherboard | Graphics | RAM |
|---|---|---|---|
| i5 2500k @ 5ghz 1.42v 24/7 | ASuS P8P67-Pro | Sapphire 7970 | 2x4GB Corsai Vengeance 1600mhz |
| Hard Drive | Optical Drive | OS | Monitor |
| 2x Crucial M4 64GB Raid-0 2x WD Caviar Blue Raid-0 | not in service | Vista 64Bit | Dell U2412M 1920x1200 IPS :) |
| Keyboard | Power | Case | Mouse |
| 9 Year old HP | Antec Truepower Quattro 1200w | Antec 1200 | Razer DeathAdder 3500DPI |
| Audio | |||
| Stock Intel Realtek | |||
| View all | |||
Kill Bill
(14 items) |
| CPU | Motherboard | Graphics | RAM |
|---|---|---|---|
| i5 2500k @ 5ghz 1.42v 24/7 | ASuS P8P67-Pro | Sapphire 7970 | 2x4GB Corsai Vengeance 1600mhz |
| Hard Drive | Optical Drive | OS | Monitor |
| 2x Crucial M4 64GB Raid-0 2x WD Caviar Blue Raid-0 | not in service | Vista 64Bit | Dell U2412M 1920x1200 IPS :) |
| Keyboard | Power | Case | Mouse |
| 9 Year old HP | Antec Truepower Quattro 1200w | Antec 1200 | Razer DeathAdder 3500DPI |
| Audio | |||
| Stock Intel Realtek | |||
| View all | |||

Current Rig.
(17 items) |
| CPU | Motherboard | Graphics | RAM |
|---|---|---|---|
| i7 3770K | Gigabyte Z77X-UD3H | XFX Radeon HD 7970 Black Edition | GSkill TridentX 16GB GTX PC19200 |
| Hard Drive | Hard Drive | Optical Drive | Cooling |
| OCZ Vector 256GB | Seagate 2TB 7200 RPM | ASUS DVDRW 24X | Corsair H80i |
| OS | Monitor | Keyboard | Power |
| Windows 8 Pro WMC x64 | Crossover 27Q-LED 1440p | Razer Arctosa | Corsair AX860i Platinum |
| Case | Mouse | Mouse Pad | Audio |
| Corsair 600T White | Razer Abyssus | Razer Goliathus | Integrated soundcard |
| Audio | |||
| Swans HiVi M50W 2.1 speaker | |||
| View all | |||
Current Rig.
(17 items) |
| CPU | Motherboard | Graphics | RAM |
|---|---|---|---|
| i7 3770K | Gigabyte Z77X-UD3H | XFX Radeon HD 7970 Black Edition | GSkill TridentX 16GB GTX PC19200 |
| Hard Drive | Hard Drive | Optical Drive | Cooling |
| OCZ Vector 256GB | Seagate 2TB 7200 RPM | ASUS DVDRW 24X | Corsair H80i |
| OS | Monitor | Keyboard | Power |
| Windows 8 Pro WMC x64 | Crossover 27Q-LED 1440p | Razer Arctosa | Corsair AX860i Platinum |
| Case | Mouse | Mouse Pad | Audio |
| Corsair 600T White | Razer Abyssus | Razer Goliathus | Integrated soundcard |
| Audio | |||
| Swans HiVi M50W 2.1 speaker | |||
| View all | |||
MyRig
(13 items) |
| CPU | Motherboard | Graphics | RAM |
|---|---|---|---|
| i7 3960x | Gigabyte GA-X79-UD3 | 3 x EVGA GTX 680 | Corsair XMS3 16Gb @ 1600Mhz |
| Hard Drive | Hard Drive | Hard Drive | OS |
| WD Caviar Black 7200 RPM 500 Gb + Intel 311 SSD... | WD Caviar Green 500 Gb (Data) | Crucial m4 SSD 128GB | Windows 7 64-bit |
| Monitor | Power | Case | Mouse |
| 3 x Samsung 23" SA950D | Corsair HX1050 | Thermaltake Chaser MK-1 | Logitech G5 |
| Audio | |||
| Logitech Wireless Gaming Headset G930 with 7.1 ... | |||
| View all | |||
MyRig
(13 items) |
| CPU | Motherboard | Graphics | RAM |
|---|---|---|---|
| i7 3960x | Gigabyte GA-X79-UD3 | 3 x EVGA GTX 680 | Corsair XMS3 16Gb @ 1600Mhz |
| Hard Drive | Hard Drive | Hard Drive | OS |
| WD Caviar Black 7200 RPM 500 Gb + Intel 311 SSD... | WD Caviar Green 500 Gb (Data) | Crucial m4 SSD 128GB | Windows 7 64-bit |
| Monitor | Power | Case | Mouse |
| 3 x Samsung 23" SA950D | Corsair HX1050 | Thermaltake Chaser MK-1 | Logitech G5 |
| Audio | |||
| Logitech Wireless Gaming Headset G930 with 7.1 ... | |||
| View all | |||


Â
If you look at his board, all PCI and PCIe are sharing resources;
Â
Â
Â
As for performance impacts due to lanes disparity, have a look here;
Â
Â
Â
Â
ケンジ
(16 items) |
| CPU | CPU | Motherboard | Graphics |
|---|---|---|---|
| i7-3960X | i7-980X | GA-X79-UD7 / GA-X58A-UD9 | 7970 + 465 |
| Graphics | RAM | RAM | Hard Drive |
| 2x 6990 + 580 | 16GB 2133 MHz | 24GB 2000 MHz | 120GB x 2 RAID0 |
| Hard Drive | Hard Drive | Cooling | Cooling |
| 120GB x 4 RAID0 | Raptor 300GB x 2 RAID0 | CPU-370 | CPU-370 |
| Cooling | Cooling | OS | Power |
| VID-AR699 | EK FB X58A-UD9 | Win 7 Ultimate x64 | 1500W / 1250W+1200W |
| View all | |||
ケンジ
(16 items) |
| CPU | CPU | Motherboard | Graphics |
|---|---|---|---|
| i7-3960X | i7-980X | GA-X79-UD7 / GA-X58A-UD9 | 7970 + 465 |
| Graphics | RAM | RAM | Hard Drive |
| 2x 6990 + 580 | 16GB 2133 MHz | 24GB 2000 MHz | 120GB x 2 RAID0 |
| Hard Drive | Hard Drive | Cooling | Cooling |
| 120GB x 4 RAID0 | Raptor 300GB x 2 RAID0 | CPU-370 | CPU-370 |
| Cooling | Cooling | OS | Power |
| VID-AR699 | EK FB X58A-UD9 | Win 7 Ultimate x64 | 1500W / 1250W+1200W |
| View all | |||


Crazy Rig
(17 items) |
| CPU | Motherboard | Graphics | Graphics |
|---|---|---|---|
| i7 920 D0 4.1ghz HT | Asus Rampage III Extreme | Zotac GTX 660 | Powercolor 7870 Tahiti LE CF |
| Graphics | RAM | Hard Drive | Optical Drive |
| Asus 6970 + 6950 (6970shader) CF | Patriot Viper Extreme 3x2gb 2000mhz | Kingston Hyperlink 120GB SSD, Crucial M4 64GB S... | LG dvd writer |
| OS | Monitor | Monitor | Keyboard |
| Window 8 Professional | DELL U3011 A01 | DELL U2313HM X3 | Steelseries 7G |
| Power | Case | Mouse | Mouse Pad |
| Seasonic 850 Silver | Corsair Obsidian 650D | Logitech G9X | Steel Series QCK |
| Audio | |||
| Asus Xonar ST | |||
| View all | |||
Crazy Rig
(17 items) |
| CPU | Motherboard | Graphics | Graphics |
|---|---|---|---|
| i7 920 D0 4.1ghz HT | Asus Rampage III Extreme | Zotac GTX 660 | Powercolor 7870 Tahiti LE CF |
| Graphics | RAM | Hard Drive | Optical Drive |
| Asus 6970 + 6950 (6970shader) CF | Patriot Viper Extreme 3x2gb 2000mhz | Kingston Hyperlink 120GB SSD, Crucial M4 64GB S... | LG dvd writer |
| OS | Monitor | Monitor | Keyboard |
| Window 8 Professional | DELL U3011 A01 | DELL U2313HM X3 | Steelseries 7G |
| Power | Case | Mouse | Mouse Pad |
| Seasonic 850 Silver | Corsair Obsidian 650D | Logitech G9X | Steel Series QCK |
| Audio | |||
| Asus Xonar ST | |||
| View all | |||