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Enough power?

post #1 of 5
Thread Starter 
Hi I recently asked this on another thread but this probably seems to be the most appropriate place to ask.

I've ordered a Tesla R2 650W power supply and I'm just wondering what are my limits when it comes to a dual GPU setup. I've kind of done this backwards it seems by selecting a power supply before deciding on what GPU('s) I'm going to get .

So to the question, would this power supply have enough power for crossfire 7870's (Tahiti LE) or crossfire 7950's.

Other components in this rig will be 3570k
Gigabyte z77x ud4h
Noctua D14
RAM: 8 GB
120 GB SSD
1000 GB Hard drive
Optical drive

I will be overclocking the CPU in time as well once (IF biggrin.gif) I get the machine up and running.

Any help would be great as what GPU('s) I choose to order depends on this answer.
post #2 of 5
http://www.legitreviews.com/article/1853/10/

If you take a look they are running a much more power hungry system on X79 with a hexacore w/ hyperthreading. With 650W you will be fine for 7950 crossfire. Maybe even 7970 crossfire but I probably wouldn't push it.
Beast
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Beast
(14 items)
 
Dell XPS Faptop
(8 items)
 
Alura :)
(11 items)
 
CPUMotherboardGraphicsRAM
i7 4790k @ 4.5ghz Asus Z97 Pro WIFI-AC Asus GTX 1080 Turbo @ 2000mhz G.Skill 2 x 8GB F3-2133C9D-16GXH 
Hard DriveOptical DriveCoolingOS
2 x Intel 730 480GB SSD in RAID 0 Asus DRW-24B1ST/BLK/B/AS Noctua NH-D15 Windows 7 Ultimate x64 
MonitorKeyboardPowerCase
2 x Asus VS239H-P Logitech G510 Seasonic SS-660XP2 Fractal Design R4 Blackout 
MouseMouse Pad
Logitech G500 Xtrac Ripper 
CPUMotherboardGraphicsRAM
Core 2 Duo T5250 @ 1.5ghz Dell 0N6705 Mobile Intel 965 Express 2 x 2GB Hyundai/Kingston DDR2 533mhz 
Hard DriveOptical DriveOSMonitor
OCZ Summit 60GB SSD Slot Load DVD-RW Windows 7 Ultimate x64 13.3 inch 1280x800 
CPUMotherboardGraphicsRAM
i5 2500k Asus P8Z68-V Pro MSI R7970 Lightning BE 2 x 4GB G.Skill Ripjaws 2133mhz 
Hard DriveOptical DriveCoolingOS
Mushkin Enhanced Chronos 240GB and WD Black 1TB Asus DRW-24B1ST Cooler Master Hyper 212 EVO Windows 7 Ultimate x64 
MonitorPowerCase
Hannspree 24 inch Thermaltake Tough Power TP-750P 750W Gold Cooler Master HAF 932 
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post #3 of 5
Holy crap someone who has bought a Telsa R2 i salute you for that

And yes even with two 7950 you sould have enough power

Note you would have about 100-150 watts left with 7950 cards
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Seravee
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Intel Core I7 6850K Gigabyte X99 Ultra Gaming Gigabyte GTX 970 G1 Gaming Kingston HyperX DDR4 Savage 3000 MHz 
Hard DriveHard DriveHard DriveHard Drive
Samsung 840 Evo WD Green WD30EZRX  WD Green WD40EZRX  WD Green WD60EZRX  
Hard DriveOptical DriveCoolingCooling
WD Red WD80EFZX 8TB  LG CH12NS30 5x Noctua NF-A14 FLX Noctua NH-D15 
OSMonitorKeyboardPower
Windows 7 64 Bit Asus PG279Q Corsair Gaming Strafe RGB EVGA SuperNova G2 750 watt 
CaseMouseMouse PadAudio
Phanteks Enthoo Luxe Roccat Kone XTD Laser Roccat Sense Metor Sennheiser HD 598 
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Onkyo TX NR646  Harman Kardon HKTS 60 CableMod E series PSU cable set CableMod LED Strips 
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post #4 of 5
Thread Starter 
Thanks guys you've put my mind at ease as there is a 7950 I have my eye on. Probably would have went with a single card solution that was a little more powerful if I could not.

Just one more question if you don't mind I was watching a review on this power supply and the guy doing the review said there is not a lot of give with the PCI-E connector once you plug the power into one of the GPU's. Is there a solution to extend the second PCI-E connector that goes into the second GPU if needs be.

A quick goggle search came up with this but I'm not entirely sure this is what it's purpose is.

http://www.quietpc.com/na-8pin-pcie-extension-ss
post #5 of 5
Because you have a very energy efficient cpu, your psu will handle a couple of 7950s no problem.

Also yes, you can use pci-E extentions if your native cables aren't long enough.
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