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Some questions about my first time Crossfiring

post #1 of 11
Thread Starter 
In a few months I'm going to be getting a new PSU, 2 extra 1080 monitors and another 6970. Right now I have a 650W, how much would be enough for my future Crossfire build? Also a bit new on Crossfire, how much more efficient will 2 6970s be than a single? I heard it wasn't 2x better but around 50% better, could someone clarify?
 
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240GB SSDx2, 320GB HDD Corsair H110 (if it's compatible with Haswell) Dual Boot Ubuntu & Windows 7 Ultimate x64 Cooler Master Stryker 
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i5 2500k ASRock Extreme3 Gen3 6970 CF 8gb 1600 
Hard DriveOSKeyboardPower
1x Crucial 60gb SSD 1x 320gb WD 1x Plextor M3 1... Dual-Boot Windows 7 Ult x64 & Ubuntu 11.04 Microsoft Sidewinder X4 Seasonic X 650W Gold 
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post #2 of 11
850w should be plenty for 2 6970's. Crossfire scaling is much better than what it used to be, 6 series scale very well i think definitely more than 50% but kinda also depends what application
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post #3 of 11
Thread Starter 
Pretty much gaming, mostly Starcraft 2, Crysis 2, Deus Ex, Battlefield 3 and possibly some other not as demanding games. I know you can use 4 graphics cards, but can you use 3? Would it be the same addition of performance? Say, a second graphics card adds 60% more performance, would the 3rd add another 60%? Or would it be watered down?
 
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Hard DriveCoolingOSCase
240GB SSDx2, 320GB HDD Corsair H110 (if it's compatible with Haswell) Dual Boot Ubuntu & Windows 7 Ultimate x64 Cooler Master Stryker 
CPUMotherboardGraphicsRAM
i5 2500k ASRock Extreme3 Gen3 6970 CF 8gb 1600 
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1x Crucial 60gb SSD 1x 320gb WD 1x Plextor M3 1... Dual-Boot Windows 7 Ult x64 & Ubuntu 11.04 Microsoft Sidewinder X4 Seasonic X 650W Gold 
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post #4 of 11
If it's a good PSU, then 650W could handle 2x6970s.

Scaling is very very good now with driver improvements. You can expect to see anything up to 99% scaling, and in almost all modern games you're talking 60-90%.

With 3, it depends what multiplier the pci lanes are running at. With my x8x8x4 it is a bit watered down...but if you have a board that can handle full speed lanes, only your CPU will limit you (and at 1080 it will limit you, regardless of how powerful it is...3 graphics cards is a lot to handle )

See this link for information regarding scaling, and note you see the biggest increases at massive resolutions due to cpu limitations. Also note that AMD drivers have improved significantly since that review.
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post #5 of 11
Thread Starter 
With 2 6970s, an 850W PSU and 3 1080 2ms monitors would I still be able to max games like Crysis 2 and Deus ex? If not then what if it was 2 monitors?
 
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CPUMotherboardGraphicsRAM
i5 2500k ASRock Extreme3 Gen3 6970 CF 8gb 1600 
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The Novice
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CPUMotherboardGraphicsRAM
Haswell Depends on motherboards when Haswell is out Radeon HD 7970 12gb 1866mhz 
Hard DriveCoolingOSCase
240GB SSDx2, 320GB HDD Corsair H110 (if it's compatible with Haswell) Dual Boot Ubuntu & Windows 7 Ultimate x64 Cooler Master Stryker 
CPUMotherboardGraphicsRAM
i5 2500k ASRock Extreme3 Gen3 6970 CF 8gb 1600 
Hard DriveOSKeyboardPower
1x Crucial 60gb SSD 1x 320gb WD 1x Plextor M3 1... Dual-Boot Windows 7 Ult x64 & Ubuntu 11.04 Microsoft Sidewinder X4 Seasonic X 650W Gold 
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Corsair 650D 
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post #6 of 11
Quote:
Originally Posted by burntphoenix View Post
With 2 6970s, an 850W PSU and 3 1080 2ms monitors would I still be able to max games like Crysis 2 and Deus ex? If not then what if it was 2 monitors?
Absolutely. With 2x6970s I was able to run both of those games maxed with 8xAA and maintain over 60fps.
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Samsung 840 Pro 256GB 4 x 2TB Barracudas in RAID10 2 x WD Blue 1TB RAID0 2 x 3TB Seagate Barracuda 
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8 x 146GB HP 10k SAS - various RAID levels RAID Controller LSI 9260-8i 512MB LiteOn IHAS124 Noctua NH-D15 
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OSPowerCase
Windows Hyper-V Server 2012 R2 2 x LiteION 750W 80PLUS Platinum RD650 24x2.5" chassis 
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space heater
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S-HVH-01
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CPUMotherboardGraphicsRAM
Intel 2500k 4.7GHz  Asus P8P67 Pro(B3) 2 x Club3D 280X 3GB 16GB g.skill 1600MHz C9 
Hard DriveHard DriveHard DriveHard Drive
Samsung 840 Pro 256GB 4 x 2TB Barracudas in RAID10 2 x WD Blue 1TB RAID0 2 x 3TB Seagate Barracuda 
Hard DriveHard DriveOptical DriveCooling
8 x 146GB HP 10k SAS - various RAID levels RAID Controller LSI 9260-8i 512MB LiteOn IHAS124 Noctua NH-D15 
OSMonitorMonitorMonitor
8.1 Enterprise Acer GD245HQ (120hz) LG W2420P LG IPS231P 
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Tannoy Mercury 5 NAD C165BEE Bowers & Wilkins 683 Cambridge Audio DACMagic+ 
CPUCPUMotherboardRAM
Intel® Xeon® Processor E5-2630 v3 (20M Cache, 2... Intel® Xeon® Processor E5-2630 v3 (20M Cache, 2... Lenovo RD650 128GB DDR4 ECC REG 
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OSPowerCase
Windows Hyper-V Server 2012 R2 2 x LiteION 750W 80PLUS Platinum RD650 24x2.5" chassis 
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post #7 of 11
Thread Starter 
Thanks for the replies, you all have been really helpful! Last question, I'm getting a bit worried about graphics card temperatures, what ways are there to cool them down? I know of water cooling around graphics cards and those custom graphics card fans or whatever they're called, are there any others? Which would be most efficient?
 
The Novice
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CPUMotherboardGraphicsRAM
Haswell Depends on motherboards when Haswell is out Radeon HD 7970 12gb 1866mhz 
Hard DriveCoolingOSCase
240GB SSDx2, 320GB HDD Corsair H110 (if it's compatible with Haswell) Dual Boot Ubuntu & Windows 7 Ultimate x64 Cooler Master Stryker 
CPUMotherboardGraphicsRAM
i5 2500k ASRock Extreme3 Gen3 6970 CF 8gb 1600 
Hard DriveOSKeyboardPower
1x Crucial 60gb SSD 1x 320gb WD 1x Plextor M3 1... Dual-Boot Windows 7 Ult x64 & Ubuntu 11.04 Microsoft Sidewinder X4 Seasonic X 650W Gold 
Case
Corsair 650D 
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The Novice
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CPUMotherboardGraphicsRAM
Haswell Depends on motherboards when Haswell is out Radeon HD 7970 12gb 1866mhz 
Hard DriveCoolingOSCase
240GB SSDx2, 320GB HDD Corsair H110 (if it's compatible with Haswell) Dual Boot Ubuntu & Windows 7 Ultimate x64 Cooler Master Stryker 
CPUMotherboardGraphicsRAM
i5 2500k ASRock Extreme3 Gen3 6970 CF 8gb 1600 
Hard DriveOSKeyboardPower
1x Crucial 60gb SSD 1x 320gb WD 1x Plextor M3 1... Dual-Boot Windows 7 Ult x64 & Ubuntu 11.04 Microsoft Sidewinder X4 Seasonic X 650W Gold 
Case
Corsair 650D 
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post #8 of 11
Quote:
Originally Posted by burntphoenix View Post
Thanks for the replies, you all have been really helpful! Last question, I'm getting a bit worried about graphics card temperatures, what ways are there to cool them down? I know of water cooling around graphics cards and those custom graphics card fans or whatever they're called, are there any others? Which would be most efficient?
Well, I just have 3x120mm fans sat on the side of my cards blowing IN.

The top one will always run hotter...mine are like (24 hour load):

top --- 80 degrees
middle --- 77 degress
bottom --- 69 degrees
space heater
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CPUMotherboardGraphicsRAM
Intel 2500k 4.7GHz  Asus P8P67 Pro(B3) 2 x Club3D 280X 3GB 16GB g.skill 1600MHz C9 
Hard DriveHard DriveHard DriveHard Drive
Samsung 840 Pro 256GB 4 x 2TB Barracudas in RAID10 2 x WD Blue 1TB RAID0 2 x 3TB Seagate Barracuda 
Hard DriveHard DriveOptical DriveCooling
8 x 146GB HP 10k SAS - various RAID levels RAID Controller LSI 9260-8i 512MB LiteOn IHAS124 Noctua NH-D15 
OSMonitorMonitorMonitor
8.1 Enterprise Acer GD245HQ (120hz) LG W2420P LG IPS231P 
MonitorMonitorKeyboardPower
HP ZR24w LG 32LH3000 (w/IPS) Razer Blackwidow Antec TruePower New 750W 
CaseMouseAudioAudio
Corsair 750D Modified original G5 Asus Xonar PCIe Sennheiser HD595 
AudioAudioAudioAudio
Tannoy Mercury 5 NAD C165BEE Bowers & Wilkins 683 Cambridge Audio DACMagic+ 
CPUCPUMotherboardRAM
Intel® Xeon® Processor E5-2630 v3 (20M Cache, 2... Intel® Xeon® Processor E5-2630 v3 (20M Cache, 2... Lenovo RD650 128GB DDR4 ECC REG 
Hard DriveHard DriveHard DriveHard Drive
720ix 12Gbps SAS RAID Controller with 1GB FBWC RAID 0 - 2 x Intel S3500 120GB SSD (deduped VHD... Intel 530 120GB SSD RAID 10 - 8 x Seagate 146GB 10k SAS  
OSPowerCase
Windows Hyper-V Server 2012 R2 2 x LiteION 750W 80PLUS Platinum RD650 24x2.5" chassis 
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Intel® Xeon® Processor X5650  8GB ECC 2 x 146GB SCSI RAID1 PfSense 2.2b 
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Intel 4 x 1GbE 
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space heater
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CPUMotherboardGraphicsRAM
Intel 2500k 4.7GHz  Asus P8P67 Pro(B3) 2 x Club3D 280X 3GB 16GB g.skill 1600MHz C9 
Hard DriveHard DriveHard DriveHard Drive
Samsung 840 Pro 256GB 4 x 2TB Barracudas in RAID10 2 x WD Blue 1TB RAID0 2 x 3TB Seagate Barracuda 
Hard DriveHard DriveOptical DriveCooling
8 x 146GB HP 10k SAS - various RAID levels RAID Controller LSI 9260-8i 512MB LiteOn IHAS124 Noctua NH-D15 
OSMonitorMonitorMonitor
8.1 Enterprise Acer GD245HQ (120hz) LG W2420P LG IPS231P 
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HP ZR24w LG 32LH3000 (w/IPS) Razer Blackwidow Antec TruePower New 750W 
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Corsair 750D Modified original G5 Asus Xonar PCIe Sennheiser HD595 
AudioAudioAudioAudio
Tannoy Mercury 5 NAD C165BEE Bowers & Wilkins 683 Cambridge Audio DACMagic+ 
CPUCPUMotherboardRAM
Intel® Xeon® Processor E5-2630 v3 (20M Cache, 2... Intel® Xeon® Processor E5-2630 v3 (20M Cache, 2... Lenovo RD650 128GB DDR4 ECC REG 
Hard DriveHard DriveHard DriveHard Drive
720ix 12Gbps SAS RAID Controller with 1GB FBWC RAID 0 - 2 x Intel S3500 120GB SSD (deduped VHD... Intel 530 120GB SSD RAID 10 - 8 x Seagate 146GB 10k SAS  
OSPowerCase
Windows Hyper-V Server 2012 R2 2 x LiteION 750W 80PLUS Platinum RD650 24x2.5" chassis 
CPURAMHard DriveOS
Intel® Xeon® Processor X5650  8GB ECC 2 x 146GB SCSI RAID1 PfSense 2.2b 
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post #9 of 11
I would be very hesitant with running it on a 650W power supply unless you weren't planning on overclocking it or the rest of your system. Realize also that the primary card will run hotter then the outside card due to the fact that it is getting less fresh air. I would recommend not using the default fan profile and using msi afterburner to set a custom fan profile instead.

As I'll always say, default fan profile is very bad for multiple card set ups on air since it doesn't know it's getting warmer/less air then before.
post #10 of 11
Quote:
Originally Posted by Arinoth View Post
I would be very hesitant with running it on a 650W power supply unless you weren't planning on overclocking it or the rest of your system.
I respect your hesitation, but I ran 2 heavily overclocked 6970s (1000/5500) off my antec truepower new 650W (648W on 12v) with no issues. This was perhaps nearing the limitations of the PSU - i didn't check. But it never got hot.
space heater
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CPUMotherboardGraphicsRAM
Intel 2500k 4.7GHz  Asus P8P67 Pro(B3) 2 x Club3D 280X 3GB 16GB g.skill 1600MHz C9 
Hard DriveHard DriveHard DriveHard Drive
Samsung 840 Pro 256GB 4 x 2TB Barracudas in RAID10 2 x WD Blue 1TB RAID0 2 x 3TB Seagate Barracuda 
Hard DriveHard DriveOptical DriveCooling
8 x 146GB HP 10k SAS - various RAID levels RAID Controller LSI 9260-8i 512MB LiteOn IHAS124 Noctua NH-D15 
OSMonitorMonitorMonitor
8.1 Enterprise Acer GD245HQ (120hz) LG W2420P LG IPS231P 
MonitorMonitorKeyboardPower
HP ZR24w LG 32LH3000 (w/IPS) Razer Blackwidow Antec TruePower New 750W 
CaseMouseAudioAudio
Corsair 750D Modified original G5 Asus Xonar PCIe Sennheiser HD595 
AudioAudioAudioAudio
Tannoy Mercury 5 NAD C165BEE Bowers & Wilkins 683 Cambridge Audio DACMagic+ 
CPUCPUMotherboardRAM
Intel® Xeon® Processor E5-2630 v3 (20M Cache, 2... Intel® Xeon® Processor E5-2630 v3 (20M Cache, 2... Lenovo RD650 128GB DDR4 ECC REG 
Hard DriveHard DriveHard DriveHard Drive
720ix 12Gbps SAS RAID Controller with 1GB FBWC RAID 0 - 2 x Intel S3500 120GB SSD (deduped VHD... Intel 530 120GB SSD RAID 10 - 8 x Seagate 146GB 10k SAS  
OSPowerCase
Windows Hyper-V Server 2012 R2 2 x LiteION 750W 80PLUS Platinum RD650 24x2.5" chassis 
CPURAMHard DriveOS
Intel® Xeon® Processor X5650  8GB ECC 2 x 146GB SCSI RAID1 PfSense 2.2b 
Other
Intel 4 x 1GbE 
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space heater
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CPUMotherboardGraphicsRAM
Intel 2500k 4.7GHz  Asus P8P67 Pro(B3) 2 x Club3D 280X 3GB 16GB g.skill 1600MHz C9 
Hard DriveHard DriveHard DriveHard Drive
Samsung 840 Pro 256GB 4 x 2TB Barracudas in RAID10 2 x WD Blue 1TB RAID0 2 x 3TB Seagate Barracuda 
Hard DriveHard DriveOptical DriveCooling
8 x 146GB HP 10k SAS - various RAID levels RAID Controller LSI 9260-8i 512MB LiteOn IHAS124 Noctua NH-D15 
OSMonitorMonitorMonitor
8.1 Enterprise Acer GD245HQ (120hz) LG W2420P LG IPS231P 
MonitorMonitorKeyboardPower
HP ZR24w LG 32LH3000 (w/IPS) Razer Blackwidow Antec TruePower New 750W 
CaseMouseAudioAudio
Corsair 750D Modified original G5 Asus Xonar PCIe Sennheiser HD595 
AudioAudioAudioAudio
Tannoy Mercury 5 NAD C165BEE Bowers & Wilkins 683 Cambridge Audio DACMagic+ 
CPUCPUMotherboardRAM
Intel® Xeon® Processor E5-2630 v3 (20M Cache, 2... Intel® Xeon® Processor E5-2630 v3 (20M Cache, 2... Lenovo RD650 128GB DDR4 ECC REG 
Hard DriveHard DriveHard DriveHard Drive
720ix 12Gbps SAS RAID Controller with 1GB FBWC RAID 0 - 2 x Intel S3500 120GB SSD (deduped VHD... Intel 530 120GB SSD RAID 10 - 8 x Seagate 146GB 10k SAS  
OSPowerCase
Windows Hyper-V Server 2012 R2 2 x LiteION 750W 80PLUS Platinum RD650 24x2.5" chassis 
CPURAMHard DriveOS
Intel® Xeon® Processor X5650  8GB ECC 2 x 146GB SCSI RAID1 PfSense 2.2b 
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Intel 4 x 1GbE 
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