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9800GTX Sli questions

post #1 of 10
Thread Starter 
Hi guys in about a months time i will be getting a 560GTX Twin Frozr II card but in the mean time (still saving) im looking at getting another 9800GTX as they are cheap as chips but all they have on ebay are 9800GTX+ cards.

Now will i be able to sli the two or does the plus card make them incompatible for sli?

Also will my current PSU be able to power both 9800 cards.

Thanks for your help in advance.
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Fear The Badger
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post #2 of 10
If the 9800 GTX can SLI with the 9800 GTX+ (I don't know either), then I'll say this about the power supply: the VX550 actually has more than enough power capacity for it.
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post #3 of 10
I don't know about the GTX+, but IIRC the 9800GTX can SLI with GTS 250s. 250s should be much easier to find.
post #4 of 10
9800GTX and 9800GTX+ can be SLIed. As 9800GTX+ has a higher core and shader clocks, it will either downclock to match the lower speed of the 9800GTX or you can try to overclock your 9800GTX to match that of the 9800GTX+.
(I just recognized your 9800GTX is an OC version. So, this might bring them closer in speed)

As for PSU, the VX550 could be the bare minimum to work. Nvidia lists an Antec True Power New 550W in their list of recommended PSU for 9800GTX SLI.
But you have to be careful because VX550 only has two native PCIE connectors. So, you will need to use two 2x-4 pin-molex-to-6 pin-PCIE adapters to have two new such PCIE connectors to work with the new 9800GTX+.
Edited by windfire - 3/2/11 at 11:15pm
post #5 of 10
Thread Starter 
ok so will the psu be able to handle them oc'ed or just run standard?
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post #6 of 10
NVIDIA recommends a 450W power supply to power a system with either a single 9800 GTX or a single 9800 GTX+ in it (I mean, it's the same for both). However, they're talking about 450W power supplies with a 450W "peak" rating. The VX550W has a 550W "continuous" rating, which means its peak could be closer to 650W.

NVIDIA also says that the maximum power draw for the 9800 GTX+ is 141W while the maximum for the 9800 GTX is 140W. But when in SLI, the 2nd card cannot draw its maximum due to the scaling of the SLI setup. But I don't know how much less power is drawn from the 2nd card, so I'll just call it 140+110W (I think I'm being too generous with these values). This gives me 250W for both cards under full load in SLI.

Now, the VX550 has a +12V continuous capacity of 492W (41A). This means that even under the highest GPU load in my example, the +12V would still have 242W left over for the rest of the system. That is, for the rest of the system that's drawing its power from the +12V, such as the CPU and other very major components.

But let's be unrealistic on purpose and say that both cards will draw exactly 140W under the fullest loads in SLI. This means that the +12V would have 212W left over, but that's still more than enough headroom for the rest of the system.

So the VX550W has more than you'll ever need for the 9800 GTX and 9800 GTX+ in SLI. But then why does NVIDIA recommend the 550W Antec TruePower New? I don't know, but I bet it has something to do with someone getting some extra money from that free advertising.

Anyway, my personal conclusion is that overclocking will not be a problem.
Edited by TwoCables - 3/3/11 at 12:06am
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post #7 of 10
u are better off saving the money for the 560 ti,its not worth spending $150-$160 on a 9800 when u can put it towards the 560 and get it sooner
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post #8 of 10
Quote:
Originally Posted by TehStranger?;12592692 
u are better off saving the money for the 560 ti,its not worth spending $150-$160 on a 9800 when u can put it towards the 560 and get it sooner
I'm shopping around for a 9800 GTX+ in Google Shopping, and I am seeing several that cost less than $90 new. Like he said, "they are as cheap as chips".
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i5-2500K @ 4.5GHz (1.368-1.384V fixed voltage) ASUS P8P67 EVO B3 (UEFI ver. 1850) GTX 780 ASUS DirectCU II (1228 / 6300, 1.180V) G.SKILL Ripjaws X 8GB (2 x 4GB) 1866MHz, CL9 
Hard DriveHard DriveHard DriveOptical Drive
250 GB Samsung 840 EVO (C:\) 250 GB Samsung 840 EVO (D:\) 150 GB WD VelociRaptor Samsung SH-S243N 24x DVD Burner 
Optical DriveCoolingOSMonitor
Samsung SH-S203N 20X DVD Burner Thermaltake Frio Win 7 Home Premium x64 SP1 Retail AOC G2460PG (24" 1920 x 1080 144Hz G-SYNC) 
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Filco Majestouch 104-key Cherry MX Blues w/NKRO Corsair HX650 (Bronze, ordered on 12-12-2009) CM 690 Intellimouse Optical (1.1A) 1000Hz polling rate 
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It's a computer!
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CPUMotherboardGraphicsRAM
i5-2500K @ 4.5GHz (1.368-1.384V fixed voltage) ASUS P8P67 EVO B3 (UEFI ver. 1850) GTX 780 ASUS DirectCU II (1228 / 6300, 1.180V) G.SKILL Ripjaws X 8GB (2 x 4GB) 1866MHz, CL9 
Hard DriveHard DriveHard DriveOptical Drive
250 GB Samsung 840 EVO (C:\) 250 GB Samsung 840 EVO (D:\) 150 GB WD VelociRaptor Samsung SH-S243N 24x DVD Burner 
Optical DriveCoolingOSMonitor
Samsung SH-S203N 20X DVD Burner Thermaltake Frio Win 7 Home Premium x64 SP1 Retail AOC G2460PG (24" 1920 x 1080 144Hz G-SYNC) 
KeyboardPowerCaseMouse
Filco Majestouch 104-key Cherry MX Blues w/NKRO Corsair HX650 (Bronze, ordered on 12-12-2009) CM 690 Intellimouse Optical (1.1A) 1000Hz polling rate 
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post #9 of 10
Quote:
Originally Posted by TehStranger?;12592692 
u are better off saving the money for the 560 ti,its not worth spending $150-$160 on a 9800 when u can put it towards the 560 and get it sooner

I see someone buys their video cards at Best Buy.
post #10 of 10
Quote:
Originally Posted by Booty Warrior;12592768 
I see someone buys their video cards at Best Buy.
If I don't pay the highest price possible for my card, then I'm getting an inferior product!

smile.gif
It's a computer!
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Hard DriveHard DriveHard DriveOptical Drive
250 GB Samsung 840 EVO (C:\) 250 GB Samsung 840 EVO (D:\) 150 GB WD VelociRaptor Samsung SH-S243N 24x DVD Burner 
Optical DriveCoolingOSMonitor
Samsung SH-S203N 20X DVD Burner Thermaltake Frio Win 7 Home Premium x64 SP1 Retail AOC G2460PG (24" 1920 x 1080 144Hz G-SYNC) 
KeyboardPowerCaseMouse
Filco Majestouch 104-key Cherry MX Blues w/NKRO Corsair HX650 (Bronze, ordered on 12-12-2009) CM 690 Intellimouse Optical (1.1A) 1000Hz polling rate 
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It's a computer!
(19 items)
 
  
CPUMotherboardGraphicsRAM
i5-2500K @ 4.5GHz (1.368-1.384V fixed voltage) ASUS P8P67 EVO B3 (UEFI ver. 1850) GTX 780 ASUS DirectCU II (1228 / 6300, 1.180V) G.SKILL Ripjaws X 8GB (2 x 4GB) 1866MHz, CL9 
Hard DriveHard DriveHard DriveOptical Drive
250 GB Samsung 840 EVO (C:\) 250 GB Samsung 840 EVO (D:\) 150 GB WD VelociRaptor Samsung SH-S243N 24x DVD Burner 
Optical DriveCoolingOSMonitor
Samsung SH-S203N 20X DVD Burner Thermaltake Frio Win 7 Home Premium x64 SP1 Retail AOC G2460PG (24" 1920 x 1080 144Hz G-SYNC) 
KeyboardPowerCaseMouse
Filco Majestouch 104-key Cherry MX Blues w/NKRO Corsair HX650 (Bronze, ordered on 12-12-2009) CM 690 Intellimouse Optical (1.1A) 1000Hz polling rate 
Mouse PadAudioAudio
Basic, but premium round X-Fi Titanium HD Klipsch ProMedia 2.1 (with 16 AWG Monster Cable... 
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