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GTS250 and 9800GT on CrossFire mobo - possible? - Page 6

post #51 of 58
Quote:
Originally Posted by Droogie View Post

Has to be more than just shader cores. A 1gb 460 won't SLI with a 768mb 460 because of other differences, even through they have the same amount of cuda cores.

Wrong. You can SLI cards with a different amount of memory. The only problem is the lower card will be the limiting factor. For example, only 768MB will be used in SLI mode. I've SLI'ed a Zotac 9800GT 512MB with a 1GB variant with no problems. I only had 512MB of usable memory, though.

EDIT: Derp, I forgot the 768MB variant only uses a 192bit memory bus, and has fewer ROPs, so you are correct. My apologies.
Quote:
Originally Posted by lordj View Post

So from all the replies I got from you guys, I assume that I cannot SLI my cards because they have slightly different chips, and if I had bought a 9800GTX+, I would have been able to SLI it with a GTS250 on my CrossFire board with some driver hacks, right?
I know that I can SLI my current cards by doing flashing BIOS stuff, but I don't want to risk losing a good card.
And one question. This is going to sound really stupid, but I just realized that my 9800GT (didn't get to pick up the 250 yet) was not connected to a power cable, the 2x3 molex. It was just connected to the PCIe slot, without the power cable. But I've played TDU2 with high settings at 1920x1080, and CPUZ recognizes the 9800GT. I'll plug it in soon (my mom is going to throw my PC in the river if she sees me doing any hardware stuff right now, it is less than a week till a big exam). Any idea of what happened/is happening with the 9800GT? I thought power supply was mandatory for the card to work.

You're most likely not supplying the card with sufficient power and aren't getting maximum performance. That and TDU2 is not a very graphically demanding game. Try that in Crysis or BF3 and I'll guarantee you will get reduced performance or BSODs.
Edited by Primus - 4/24/12 at 11:02am
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post #52 of 58
Thread Starter 
Quote:
Originally Posted by Primus View Post

Quote:
Originally Posted by Droogie View Post

Has to be more than just shader cores. A 1gb 460 won't SLI with a 768mb 460 because of other differences, even through they have the same amount of cuda cores.

Wrong. You can SLI cards with a different amount of memory. The only problem is the lower card will be the limiting factor. For example, only 768MB will be used in SLI mode. I've SLI'ed a Zotac 9800GT 512MB with a 1GB variant with no problems. I only had 512MB of usable memory, though.

EDIT: Derp, I forgot the 768MB variant only uses a 192bit memory bus, and has fewer ROPs, so you are correct. My apologies.
Quote:
Originally Posted by lordj View Post

So from all the replies I got from you guys, I assume that I cannot SLI my cards because they have slightly different chips, and if I had bought a 9800GTX+, I would have been able to SLI it with a GTS250 on my CrossFire board with some driver hacks, right?
I know that I can SLI my current cards by doing flashing BIOS stuff, but I don't want to risk losing a good card.
And one question. This is going to sound really stupid, but I just realized that my 9800GT (didn't get to pick up the 250 yet) was not connected to a power cable, the 2x3 molex. It was just connected to the PCIe slot, without the power cable. But I've played TDU2 with high settings at 1920x1080, and CPUZ recognizes the 9800GT. I'll plug it in soon (my mom is going to throw my PC in the river if she sees me doing any hardware stuff right now, it is less than a week till a big exam). Any idea of what happened/is happening with the 9800GT? I thought power supply was mandatory for the card to work.

You're most likely not supplying the card with sufficient power and aren't getting maximum performance. That and TDU2 is not a very graphically demanding game. Try that in Crysis or BF3 and I'll guarantee you will get reduced performance or BSODs.


Alright. Thanks for your answer. I'll plug it in when my exams are over biggrin.gif
   
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post #53 of 58
I didn't bother reading this thread, but from the two pages I DID read, the GTS250 isn't THAT bad of a card.
IIRC, I was gaming BF3 on that puppy for a long time, until I decided to beef up and get a 6950 2GB.

The 250GTS handled BF3 on HIGH, with an AMD Athlon II 620 chugging along with it.
Everything at clock speeds.

Pretty amazing IMO.

EDIT:
From what I've seen & heard, crossfiring and SLi-ing can get pretty annoying at times when some things go bad, they go bad, and frustrate.
I've seen many posts with people unhappy with dual cards, but then again, it's always the bad things you hear about.
post #54 of 58
Thread Starter 
Quote:
Originally Posted by rawfuls View Post

I didn't bother reading this thread, but from the two pages I DID read, the GTS250 isn't THAT bad of a card.
IIRC, I was gaming BF3 on that puppy for a long time, until I decided to beef up and get a 6950 2GB.
The 250GTS handled BF3 on HIGH, with an AMD Athlon II 620 chugging along with it.
Everything at clock speeds.
Pretty amazing IMO.
EDIT:
From what I've seen & heard, crossfiring and SLi-ing can get pretty annoying at times when some things go bad, they go bad, and frustrate.
I've seen many posts with people unhappy with dual cards, but then again, it's always the bad things you hear about.

Thanks for your reply. But will I feel a significant improvement over my 9800GT, if I use the 250 as single?
   
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post #55 of 58
I have an 8800 gt, 9800 gt,9800 gtx+ and 2, 250 gts's . There isn't a huge difference between any of them at stock clocks. At most I would say 15 % better performance in 3d mark 06.
The 9800 gt is rated for a 400 watt minimum psu whereas the 250 gts is rated for a 450 watt.
Obviously the 250 is a better card, but not by a great margin.
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post #56 of 58
Thread Starter 
Quote:
Originally Posted by cssorkinman View Post

I have an 8800 gt, 9800 gt,9800 gtx+ and 2, 250 gts's . There isn't a huge difference between any of them at stock clocks. At most I would say 15 % better performance in 3d mark 06.
The 9800 gt is rated for a 400 watt minimum psu whereas the 250 gts is rated for a 450 watt.
Obviously the 250 is a better card, but not by a great margin.

So I won't see a significant wow-inducing improvement, but I still would notice a lil difference when I switch?
   
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post #57 of 58
Your best bet is to sell both and get something more up to date. Both cards are nearing obsolete status.

Sent from my Galaxy Nexus using Tapatalk 2
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post #58 of 58
Thread Starter 
Quote:
Originally Posted by Droogie View Post

Your best bet is to sell both and get something more up to date. Both cards are nearing obsolete status.

Sent from my Galaxy Nexus using Tapatalk 2

I'll consider that. Thinking GTX 560.
   
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