Im confused? SLI & CrossFire

FairDoos · 10-06-2009, 10:01 AM

Ok so recently ive bought a new PSU as my old one didnt power everything :l Owell but yer to the point.. My new PSU says its SLI Certified right but i was thinking generally GFX Cards have 2 power slots like 6-pins and there is only 2 on the PSU so if one card is using the 2 already on the PSU where is the other card going to get its power from?

Sorry if this is obvious im a noob to SLI & CrossFire

linkin93 · 10-06-2009, 10:54 AM

If you had 2x 9600GTs' (or any graphics card that uses one 6pin connector) and a compatible motherboard it could do sli. Same goes for crossfire.

FairDoos · 10-06-2009, 01:08 PM

Quote:

Originally Posted by linkin93

If you had 2x 9600GTs' (or any graphics card that uses one 6pin connector) and a compatible motherboard it could do sli. Same goes for crossfire.

What about say if i wanted 2 4890's in CrossFire how would you go about doing that?

Bodaggit23 · 10-06-2009, 01:10 PM

In that case, you would need molex to 6pin adapters, providing your psu has enough power.

FairDoos · 10-06-2009, 01:10 PM

Quote:

Originally Posted by Bodaggit23

In that case, you would need molex to 6pin adapters, providing your psu has enough power.

I have a 700W ModXStream PRO do you think that could handle 2 4890s?

Ethan3.14159 · 10-06-2009, 01:13 PM

Quote:

Originally Posted by FairDoos

I have a 700W ModXStream PRO do you think that could handle 2 4890s?

Should be alright. I had the 600 watt model, solid PSU. You should have enough connectors. I don't know why but I never liked the thought of using 6 pin to molex adapters.

Bodaggit23 · 10-06-2009, 01:29 PM

Quote:

Originally Posted by FairDoos

I have a 700W ModXStream PRO do you think that could handle 2 4890s?

I don't think so.

The 700W ModXStream Pro only has 552watts on the 12+ rail.

ATI recommends at least 600watts for Crossfire.

Ethan3.14159 · 10-06-2009, 01:55 PM

If you want to upgrade your PSU that's fine. Certainly won't hurt. I'm just saying that it isn't necessary for what you want.

FairDoos · 10-06-2009, 01:57 PM

Quote:

Originally Posted by Ethan3.14159

If you want to upgrade your PSU that's fine. Certainly won't hurt. I'm just saying that it isn't necessary for what you want.

What about if i wanted 2 5850's in Crossfire?

Which i probably will get in the future if i can get to understand Crossfire

Ethan3.14159 · 10-06-2009, 02:03 PM

As you can see here the 5850 uses slightly less power than the 4890. Notice the full system load of the 2 5850's in crossfire? 469 watts. You'll be fine. Also, a worthy note that it uses 70 watts less than the GTX 285, which the 5850 beats.

10-06-2009, 10:01 AM	#1 (permalink)
FairDoos Diamond Member Join Date: Dec 2008 Location: Manchester, UK Age: 16 Posts: 1,270	Im confused? SLI & CrossFire Ok so recently ive bought a new PSU as my old one didnt power everything :l Owell but yer to the point.. My new PSU says its SLI Certified right but i was thinking generally GFX Cards have 2 power slots like 6-pins and there is only 2 on the PSU so if one card is using the 2 already on the PSU where is the other card going to get its power from? Sorry if this is obvious im a noob to SLI & CrossFire __________________ CPU:AMD Phenom II 955 BE X4 @ 3.4GHz GPU: ASUS ATi 4890 HDD: 1TB Seagate Barracuda RAM: 4GB (2 X 2GB) Dominator GT RAM CPU Cooler: Tuniq Tower 120 Motherboard: ASUS Crosshair Formula III

10-06-2009, 10:54 AM	#2 (permalink)
linkin93 Diamond Member Join Date: Jun 2009 Location: NSW, Australia Age: 16 Posts: 2,372	If you had 2x 9600GTs' (or any graphics card that uses one 6pin connector) and a compatible motherboard it could do sli. Same goes for crossfire. __________________ System CM Storm Scout - Asus P5N-E SLI - Core 2 Duo E4500 @ 3.02Ghz - 2x1GB Corsair XMS2 @ 900mhz - Sapphire HD 3870 - WD 250GB Caviar SE16 - SHAW 860W - Windows 7 Ultimate x64 Perhiprials Logitech G5 Mouse - Logitech R-10 Speakers - Targus Keyboard - HP L1470 17" 1280x1024 Monitor

10-06-2009, 01:10 PM	#4 (permalink)
Bodaggit23 Diamond Member Join Date: Mar 2009 Location: Aperture Science Posts: 4,554	In that case, you would need molex to 6pin adapters, providing your psu has enough power. __________________ Team Stats @ ExtremeOverclocking.com Team Stats FOLDING FOR THE GOOD OF MANKIND :F@H Team 44358 CPU: i7 920 Batch#3841A525 (@3.43Ghz) Board: EVGA E758-A1 Memory: Dominator 3x2GB DDR3 1600 Hard Drive: 300GB VelociRaptor GPU: EVGA GTX260 SC Core 216 Optical: Sony Optiarc 22x DVD/CD Burner PSU: Corsair TX850W CPU Cooling: Noctua NH-U12P SE1366 Primary OS: Windows Vista x64 SP2 Case: Coolermaster HAF 932

10-06-2009, 01:55 PM	#8 (permalink)
Ethan3.14159 Diamond Member Join Date: May 2008 Location: Auckland, New Zealand Age: 19 Posts: 1,692	If you want to upgrade your PSU that's fine. Certainly won't hurt. I'm just saying that it isn't necessary for what you want. __________________ CPU: AMD Phenom X4 9950 BE MB: Asus M3N-HT 780a RAM: 4GB OCZ Platinum DDR2 800 GPU: XFX GTX 260 55nm PSU: Silverstone DA650 650 watt HDD: Seagate Barracuda 1 TB 7200.12 Case: Cooler Master CM 690 Pure Black Edition (1 of only 300) OS: Windows 7 Ultimate Other: Logitech G15, Microsoft Sidewinder, Logitech X-230 PM me for a Lockerz.com invite Folding for the good of mankind: Team 44358

10-06-2009, 02:03 PM	#10 (permalink)
Ethan3.14159 Diamond Member Join Date: May 2008 Location: Auckland, New Zealand Age: 19 Posts: 1,692	As you can see here the 5850 uses slightly less power than the 4890. Notice the full system load of the 2 5850's in crossfire? 469 watts. You'll be fine. Also, a worthy note that it uses 70 watts less than the GTX 285, which the 5850 beats. __________________ CPU: AMD Phenom X4 9950 BE MB: Asus M3N-HT 780a RAM: 4GB OCZ Platinum DDR2 800 GPU: XFX GTX 260 55nm PSU: Silverstone DA650 650 watt HDD: Seagate Barracuda 1 TB 7200.12 Case: Cooler Master CM 690 Pure Black Edition (1 of only 300) OS: Windows 7 Ultimate Other: Logitech G15, Microsoft Sidewinder, Logitech X-230 PM me for a Lockerz.com invite Folding for the good of mankind: Team 44358 Last edited by Ethan3.14159; 10-06-2009 at 02:08 PM.

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search
Display Modes
Switch to Linear Mode Hybrid Mode Switch to Threaded Mode

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
help with SLI or Crossfire!!!!!	ganzey	Video Cards and Monitors	2	07-21-2009 07:53 PM
Crossfire mobo, SLI ready also?	512mb	Video Cards and Monitors	8	08-03-2008 09:54 AM
ATI HD4850 CrossFire Question	some1	Video Cards and Monitors	12	07-12-2008 08:41 PM
Upgrade? SLI? Confused...	th3ha1og0d	Motherboards	3	07-03-2008 01:40 AM
4870 - Crossfire vs SLI	Kornowski	Video Cards and Monitors	12	06-26-2008 03:25 AM