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AMD R9 290/290x Issues Thread - Page 7

post #61 of 79
Quote:
Originally Posted by rdr09 View Post

that $100 one i guess. but it is half as fast as the R9 280 i suggested earlier. the R9 280 is a rebranded HD 7950. i got the latter for $100 off the bay. still using it now without an issue going on six months. this is my third one. i sold my other 7950 last Dec 2013 for $325. lol

edit: wait: the R7 250 is a rebranded HD 7750. no good . . . slow. no better than what you have currently. the R7 260X is equal to the HD 7790, which is still way slower than the HD 7950 or R9 280 but it will game. I hate to say this . . . go for that.

any links for reference? I'm a little lost with all these numbers haha
post #62 of 79
Quote:
Originally Posted by solace49 View Post

any links for reference? I'm a little lost with all these numbers haha

here are the R9s . . .

http://www.club-3d.com/index.php/products/graphics-card/amd/series/radeon-r9-series.en.html

R7s . . .

http://www.club-3d.com/index.php/products/graphics-card/amd/series/radeon-r7-series.en.html
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post #63 of 79
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post #65 of 79
Quote:
Originally Posted by solace49 View Post

why did you "hate to say" to go for the R7 260X?

'cause it is not worth the price of a 2GB car. my HD7950, like i said, is only $100. it is much more powerful than that.

gl with the choice.
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post #66 of 79
Quote:
Originally Posted by rdr09 View Post

'cause it is not worth the price of a 2GB car. my HD7950, like i said, is only $100. it is much more powerful than that.

gl with the choice.

how did you get such a good deal then?
post #67 of 79
Quote:
Originally Posted by solace49 View Post

how did you get such a good deal then?

i have no qualms buying used, especially if the item is less than $300.

the 7950 i sold for good price was during the ht of the mining craze. the craze died and got tired of my HD7770, so i went and bought another 7950. perfect with my Phenom or even with my i7 SB.

http://www.ebay.com/itm/Sapphire-AMD-Radeon-HD-7950-3-GB-GPU-11196-19-with-BOOST-DUAL-X-/321752862005?pt=LH_DefaultDomain_0&hash=item4ae9f70d35

this one is used too . . .

http://www.3dmark.com/3dm/4616436?

easy 1200MHz.
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post #68 of 79

after this last experience I'm not comfortable with R anything period on my MOBO. AMD 7something with at least 2 GB of vRAM should be good enough. and compatible........
post #69 of 79
Thread Starter 
Sorry I haven't been around guys, I've had a lot of "real life issues" to sort out.

While researching into pcie power cable wire configurations in order to ensure I correctly migrate modular cables from my 750W seasonic power supply to my 1200w thermaltake, I stumbled across a psu pin out article that mentioned the "upcoming 295x2" would require a psu capable of supplying amps and wattages above normal specification per 12v line for the 12v wires in the pcie connectors, despite requiring 4x 8pin connectors already specified for a total 150w each (50w per line, 3 lines per connector being standard specification).

Now that article was written before the 295x2 was released and I have next to no knowledge of that card, but as it is basically 2 290x's on one card I am now wondering if the 290x also requires higher than specification watts and amps, albeit over the 2 pcie connectors it has rather than 4 for the 295x2.

This assumption could confirm why some people have had success in eliminating the crashes by switching power supplies, even when they already had a high quality psu at or above reccommended wattage to begin with, and potentially why a motherboard bios update can help if the card is drawing more power through the pcie socket than standard specification originally intended.

My cables are now complete, so I will be stripping down my pc to switch the psu's tomorrow to test this theory.

The thermaltake psu I will be using is able to deliver 32 amps to each of the pcie connectors over independent rails, with another 20 amps to feed the cpu / motherboard / pcie socket, and a further 20 amps for peripherals and the additional pcie power molex connector.

That's a total of 64 amps solely to the gpu through the pcie power connectors, and the remainder of a further 40 amps, after other system components have been accounted for, via the pcie socket.

In comparison my current seasonic psu can "only" deliver 62 amps shared throughout the entire system on a single rail.

Put simply, if my thermaltake psu isn't able to deliver enough power to eliminate the crashes under load, then it's fairly safe to assume it's not a power related issue.

But if my theory is correct, and the switch solves the issue, then we can perhaps look into exactly how many amps / watts per 12v line are actually required for stable operation, and make a list of psu's able to supply this, rather than relying on vague reccommended total wattages.

Should this be the case then perhaps we should also lobby AMD to start advertising the actual per-line requirements rather than total psu wattage, which doesn't always translate to what is available over the pcie connectors due to manufacturers balancing loads differently per model.
Edited by DaUn3rD0g - 5/18/15 at 6:05pm
post #70 of 79
Thread Starter 
@solace49 my test tomorrow may well interest you to, the constant rebooting you describe in other threads would certainly point to a power supply issue.

I notice your psu also does 62 amps on a single 12v rail just as my seasonic does, however it doesn't quite handle going over the rated specification quite so well, which could account for your computer going into shut down if it's triggering over current protection, whereas mine just locks up under load (possibly due to it reducing / cutting power off to the gpu to avoid the overload, but causing the display to fail which may as well of been a shut down and reboot for all the good it does to actual system usage).

If my findings tomorrow indicate that my theory regarding amp requirements being over standard specification are correct, we may be able to open up another option for you of returning your new psu for an alternative that can handle the higher 12v amp requirement.

But of course that depends on my findings tomorrow.

EDIT: Just as a final thought before bed, this is not the first time I've encountered an issue like this, in fact it was a similar issue that made me buy the 1200w thermaltake psu in the first place.

Years ago I was running 2x 8800gts in sli, but my system kept randomly blue screening with error messages that pointed towards hard drive failure.

After going through countless replacement hard drives I started replacing other system components to track down the issue, eventually I had enough components for a whole new system and upon installing the supposedly dead hard drives I discovered that they weren't dead at all, nor was the motherboard I replaced assuming faulty sata controller.

What I eventually worked out the problem to be was the 600w enermax power supply I had at the time wasn't enough for the 2 card sli, and was turning off system hard drives / cutting power to the motherboard in order to compensate for the draw from the gpus.

It was the last thing I checked because only a 450w psu was recommended for 8800gts in sli, so I never imagined my 600w wasn't up
to the job.

I don't know why it's taken me so long to remember that, and it only makes me more convinced that my test tomorrow with a much more capable psu will have positive results, but we shall see.
Edited by DaUn3rD0g - 5/18/15 at 6:52pm
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