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Power Supplies and Software ATi Crossfire help and discussion - Page 2

post #11 of 29
It's not the PSU.

If anything, it's the game you are playing, some games are awful with Crossfire.

For instance, I could play GTA IV perfectly at 2560 x 1440 with my 5850, but with my 5970, even at lower settings, the microstutter and lag can drop to sub 15FPS, rendering it unplayable (well, not enjoyable to play at all).

I've never seen crossfire benchmarks for that card, and there is probably a reason for that, too.
    
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post #12 of 29
Thread Starter 
Quote:
Originally Posted by SmokinWaffle View Post
It's not the PSU.

If anything, it's the game you are playing, some games are awful with Crossfire.

For instance, I could play GTA IV perfectly at 2560 x 1440 with my 5850, but with my 5970, even at lower settings, the microstutter and lag can drop to sub 15FPS, rendering it unplayable (well, not enjoyable to play at all).

I've never seen crossfire benchmarks for that card, and there is probably a reason for that, too.
It could be the games I'm playing, you're right. Perhaps I'll try a few more.
Edited by bullet937 - 1/24/11 at 4:29pm
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post #13 of 29
Thread Starter 
Quote:
Originally Posted by Phaedrus2129 View Post
I'd like to know exactly what equipment you used and what exactly you did.

I've gotta go to a lab soon, so I won't be able to respond for a couple hours, but I want to know exactly what you claim to have done when I get back.
Okay.

I used my tower as the test bench "specs are below w/ a few changes"
A HIS H467QS1GH Radeon HD 4670
A Antec earthwatts EA430 430W PSU
And a Rosewill RP600V2-S-SL 600W PSU

What I did was Simple: While using my Antec 430W PSU, I ran a game "Halo PC for this test" and measured the frame rate. Then, I hooked up the 600 Watt PSU and ran the game again "Exact same settings, absolutely nothing changed but the PSU" and the frame rate went significantly higher.

I've ran into this before, it was the reason I ran the test in the first place. I had advised someone else to purchase a new PSU in hopes of getting their video card performance up and I received a lot of lip from many people about it lol. I used to have a video and even an overclock.net post on the topic, but took it down "I don't remember why now lol".

If you still are skeptical, I'll go dig the 430watt Antec out of my mom's tower and run the test again to show you. "This time I'd leave it up =P"
Edited by bullet937 - 1/24/11 at 4:30pm
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post #14 of 29
I've run my system with just a single HD4870 on the Antec EA430 without a hitch. The HD4870 is about a 160W card, vs the 4670 which is about a 50W card.


PSUs do not generally directly affect system performance unless there's something seriously wrong with the PSU. And I don't blame people for giving you flack for telling someone that upgrading their PSU to improve performance. Heck, I would.
post #15 of 29
Thread Starter 
Quote:
Originally Posted by Phaedrus2129 View Post
I've run my system with just a single HD4870 on the Antec EA430 without a hitch. The HD4870 is about a 160W card, vs the 4670 which is about a 50W card.


PSUs do not generally directly affect system performance unless there's something seriously wrong with the PSU. And I don't blame people for giving you flack for telling someone that upgrading their PSU to improve performance. Heck, I would.
Yea lol, but it turned out he had the same problem and a new PSU actually helped him. I know that you can run bigger cards on that 430W PSU, I've ran a 4850 and 4830 on it myself "not at the same time of course" and they worked fine. It goes back to what i think is the problem here: the 4670 was using the single 12v rail that the motherboard is on and because it's only 17amps per rail for that PSU, even a single 4670 starved it.
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post #16 of 29
Actually Phaedrus, there can be a grey area with GPU power.
There's a point when the card is getting enough power to run 2d clocks, but not enough for full 3d clocks. That can cause a lot of tricky to diagnose trouble for people who don't know what furmark or kombuster are.
Most GPUs do go for a full power test as they start up, but that's always at a point when the motherboard is still in a pretty low power use state. It is possible (but unlikely) that a pair of graphics cards could be pulling more than the motherboard is willing to supply when it's fully fired up, but usually that just ends up with melty 24 pin connectors, not faults like this.

Add in the fact that Xfire in any ATi card before the 6000 series is almost always awful beyond any words OCN will allow, and software Xfire is worse still, and you're in a world of annoyance.
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post #17 of 29
If it were due to "rails", then the OCP would kick in and shut down the system. And if it has to do with voltage drop then it would affect the entire system regardless of rails, since they all share the same rectifier.
post #18 of 29
Thread Starter 
Quote:
Originally Posted by Phaedrus2129 View Post
If it were due to "rails", then the OCP would kick in and shut down the system. And if it has to do with voltage drop then it would affect the entire system regardless of rails, since they all share the same rectifier.
Hmm, you might be right about the entire system slowing down. I think I'll run a GPU Benchmark, and simultaneously run a CPU bench to see if the CPU is slowed down / errors. If it does, that would basically tell me we're both right. The whole system is being deprived, hence the lacking in video performance.
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post #19 of 29
Quote:
Originally Posted by Phaedrus2129 View Post
It's a common myth, but cards don't get "power starved". Either they get a voltage that their VRMs can convert to the required voltage, or they stop working. There's no gray area.
What this man said.
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post #20 of 29
Thread Starter 
Quote:
Originally Posted by GameBoy View Post
What this man said.
Lol, you really need to read the rest of the stuff... as I already pointed out the flaw in what he said.
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