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Need help buying another HD7970 to match my current one

post #1 of 13
Thread Starter 
Hi all

So Ive been looking around and I'm confused about sli and crossfire on how it all works. I currently use a HD7970 card and wanna get another one.
I know all the new r9 cards have come out but i wanna wait another 6 months before not using my current pc anymore, the issue i have is Ive found a card similar
to my current HD7970 but there's a slight difference from something called UEFI. On a side note I would like to buy this card as soon as possible as it seems
where I'm getting it from there is only one left at $300.

The final issues i have are i don't know if my motherboard is compatible with what I wanna do and whether my 600w power supply will be enough. Ive never
put a PC together so I'm getting someone to do it for a $90 fee plus about $120 for a new case and fans. Yes I'm afraid to put a PC together myself i cant afford
to make mistakes. I recently bought a new 144hz monitor would be nice to get that kind of fps in high end games like Battlefield 4 and Dragon age as a example
with my current rig i get 80fps max would be nice to get higher so i feel like the monitor was worth the money.


New Monitor
http://www.benq.com.au/product/monitor/xl2720z/

Current Card
http://www.powercolor.com/us/products_features.asp?id=398

Card i wanna buy
http://www.powercolor.com/au/products_features.asp?id=465#Specification

Current Power Supply
http://www.thermaltake.com.au/products-model_Specification.aspx?id=C_00001775

Current Mother Board
http://www.gigabyte.com.au/products/product-page.aspx?pid=4408#ov
Edited by Ark-07 - 3/12/15 at 1:14am
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1863GB Seagate ST2000DM001-1CH164 ATA Device (S... samsung ssd 250gb Seagate st2000dx001 Corsair h105 water cooler 
CoolingCoolingCoolingOS
Coolmaster 120mm 1800rpm fans x 3 Corsair 120mm 1600rpm fan x 3 Thermaltake 140mm 1600rpm x 2 WIndows 10 64bit 
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post #2 of 13
Just get it , the UEFI bios on the card works with windows 8/8.1 (someone correct me if wrong) but it should have no problem on your system provided you have enough power

edit I see you have a 600w PSU, it may not be enough IIRC 750 is minimum for Xfire on those cards but you can always upgrade that or power the second card off a supplemental psu
Edited by diggiddi - 3/12/15 at 1:22am
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post #3 of 13
Thread Starter 
Information on the internet about HD7970's power supply is unreliable so many different numbers on power consumption ill get the power supply below hopefully its enough.

http://www.msy.com.au/nsw/ultimo/pc-components/12174-thermaltake-evo-850mpcgau-850w-evo-blue-20-80-gold-cable-management-psu-power-supply.html
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(19 items)
 
  
CPUMotherboardGraphicsRAM
Intel Core i7 6700k overclocked @4.5ghz Gigabyte z170x gaming 7 Gigabyte R9 Fury 16.0GB Dual-Channel DDR4 @3200mhz Gskill Ripjaws V 
Hard DriveHard DriveHard DriveCooling
1863GB Seagate ST2000DM001-1CH164 ATA Device (S... samsung ssd 250gb Seagate st2000dx001 Corsair h105 water cooler 
CoolingCoolingCoolingOS
Coolmaster 120mm 1800rpm fans x 3 Corsair 120mm 1600rpm fan x 3 Thermaltake 140mm 1600rpm x 2 WIndows 10 64bit 
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Intel Core i7 6700k overclocked @4.5ghz Gigabyte z170x gaming 7 Gigabyte R9 Fury 16.0GB Dual-Channel DDR4 @3200mhz Gskill Ripjaws V 
Hard DriveHard DriveHard DriveCooling
1863GB Seagate ST2000DM001-1CH164 ATA Device (S... samsung ssd 250gb Seagate st2000dx001 Corsair h105 water cooler 
CoolingCoolingCoolingOS
Coolmaster 120mm 1800rpm fans x 3 Corsair 120mm 1600rpm fan x 3 Thermaltake 140mm 1600rpm x 2 WIndows 10 64bit 
MonitorMonitorKeyboardPower
BenQ XL2720Z Phillips 24inch logitch mk700 Antec 620w Bronze+ 
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post #4 of 13
Unless you plan to heavily overclock the cards, you could probably use a high quality 600w PSU. Guru3D measures 567 watts full load with a overclocked i7 965 (130w TDP rating) and they estimate the GPUs draw ~407w. . If you wanted to play it safe and buy a larger PSU, I'd typically recommend the EVGA G2 750 SuperNOVA as its usually the best value in the USA. It's $145 on MSY (cheaper than the Thermaltake), but I'm not sure its the best value in Australia.

Edit: Setting up crossfire should just be a matter of plugging in the second card (+bridge) and enabling crossfire with maybe a fresh install of the drivers.
Edited by BBZZHH - 3/12/15 at 2:50am
post #5 of 13
check your motherboard. second card might run at X4. not good.

just save more for a better upgrade all around. the r9 370(X) with 4GB might cost just as much. using less power.
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post #6 of 13
Thread Starter 
The EVGA G2 750 SuperNOVA is totally out of stock shows its popularity and rdr09 what do you mean by the second card might run at x4? As far as i can tell it supports crossfire which is the amd version right?

http://www.gigabyte.com.au/products/product-page.aspx?pid=4408#ov
Edited by Ark-07 - 3/12/15 at 3:23am
Current rig
(19 items)
 
  
CPUMotherboardGraphicsRAM
Intel Core i7 6700k overclocked @4.5ghz Gigabyte z170x gaming 7 Gigabyte R9 Fury 16.0GB Dual-Channel DDR4 @3200mhz Gskill Ripjaws V 
Hard DriveHard DriveHard DriveCooling
1863GB Seagate ST2000DM001-1CH164 ATA Device (S... samsung ssd 250gb Seagate st2000dx001 Corsair h105 water cooler 
CoolingCoolingCoolingOS
Coolmaster 120mm 1800rpm fans x 3 Corsair 120mm 1600rpm fan x 3 Thermaltake 140mm 1600rpm x 2 WIndows 10 64bit 
MonitorMonitorKeyboardPower
BenQ XL2720Z Phillips 24inch logitch mk700 Antec 620w Bronze+ 
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Current rig
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Intel Core i7 6700k overclocked @4.5ghz Gigabyte z170x gaming 7 Gigabyte R9 Fury 16.0GB Dual-Channel DDR4 @3200mhz Gskill Ripjaws V 
Hard DriveHard DriveHard DriveCooling
1863GB Seagate ST2000DM001-1CH164 ATA Device (S... samsung ssd 250gb Seagate st2000dx001 Corsair h105 water cooler 
CoolingCoolingCoolingOS
Coolmaster 120mm 1800rpm fans x 3 Corsair 120mm 1600rpm fan x 3 Thermaltake 140mm 1600rpm x 2 WIndows 10 64bit 
MonitorMonitorKeyboardPower
BenQ XL2720Z Phillips 24inch logitch mk700 Antec 620w Bronze+ 
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post #7 of 13
Quote:
Originally Posted by rdr09 View Post

check your motherboard. second card might run at X4. not good.

just save more for a better upgrade all around. the r9 370(X) with 4GB might cost just as much. using less power.

Yeah, looks like rdr09 is right. Click the Specs tab on the Gigabyte page or here. I'm sure crossfire will technically work, but you'll probably run into bandwidth limitations with a 7970.
post #8 of 13
Quote:
Originally Posted by Ark-07 View Post

The EVGA G2 750 SuperNOVA is totally out of stock shows its popularity and rdr09 what do you mean by the second card might run at x4? As far as i can tell it supports crossfire which is the amd version right?

http://www.gigabyte.com.au/products/product-page.aspx?pid=4408#ov

He's referring to the PCIE lanes on your motherboard.

Your first GPU will run at PCIE x16, but your second will run at either PCIE x8 or PCIE x4 depending on your motherboard. PCIE x4 will limit the bandwidth of the GPU and can potentially limit your FPS.
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post #9 of 13
Thread Starter 
What kind of bandwidth limitations? Had a look around what a bummer guess ill wait a few months to compare the upcoming nvidia and amd cards.

Does having pcie 3.0 help?
Edited by Ark-07 - 3/12/15 at 5:01am
Current rig
(19 items)
 
  
CPUMotherboardGraphicsRAM
Intel Core i7 6700k overclocked @4.5ghz Gigabyte z170x gaming 7 Gigabyte R9 Fury 16.0GB Dual-Channel DDR4 @3200mhz Gskill Ripjaws V 
Hard DriveHard DriveHard DriveCooling
1863GB Seagate ST2000DM001-1CH164 ATA Device (S... samsung ssd 250gb Seagate st2000dx001 Corsair h105 water cooler 
CoolingCoolingCoolingOS
Coolmaster 120mm 1800rpm fans x 3 Corsair 120mm 1600rpm fan x 3 Thermaltake 140mm 1600rpm x 2 WIndows 10 64bit 
MonitorMonitorKeyboardPower
BenQ XL2720Z Phillips 24inch logitch mk700 Antec 620w Bronze+ 
CaseMouseAudio
Corsair c70 Vengeance logitch mk700 Motherboard Sound Chip Sound blaster 
  hide details  
Reply
Current rig
(19 items)
 
  
CPUMotherboardGraphicsRAM
Intel Core i7 6700k overclocked @4.5ghz Gigabyte z170x gaming 7 Gigabyte R9 Fury 16.0GB Dual-Channel DDR4 @3200mhz Gskill Ripjaws V 
Hard DriveHard DriveHard DriveCooling
1863GB Seagate ST2000DM001-1CH164 ATA Device (S... samsung ssd 250gb Seagate st2000dx001 Corsair h105 water cooler 
CoolingCoolingCoolingOS
Coolmaster 120mm 1800rpm fans x 3 Corsair 120mm 1600rpm fan x 3 Thermaltake 140mm 1600rpm x 2 WIndows 10 64bit 
MonitorMonitorKeyboardPower
BenQ XL2720Z Phillips 24inch logitch mk700 Antec 620w Bronze+ 
CaseMouseAudio
Corsair c70 Vengeance logitch mk700 Motherboard Sound Chip Sound blaster 
  hide details  
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post #10 of 13
PCI e 3.0 is basically double PCI e 2.0
ie PCI e 3.0 x8 = PCI e 2.0 x16
PCI e 3.0 x4 = PCI e 2.0 x8

I'm pretty confident anything PCI e 3.0 x8 or above will not bottleneck.
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