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So I've got a Sapphire r9 290x lying around here with no use, how can i build a cheap scrypt rig with it? :D

edit: Getting "No signals" on my monitor when i try to run the 290x any ideas why? 450w supply

Sell it to me
Fastest mining ever  :)

I actually bought it without knowing my psu only did 450w.. so now I want a cheap open rig for my card  ;)

I'm trying to build a rig too, but i think it's not convenient with only 1 card. You need at least a motherboard, a crappy cpu and hd, 2gb RAM, and a good psu. But 450w should work for only 1 card..

The 290x requires 750w if I'm not mistaken?

https://litecoin.info/Mining_hardware_comparison

According to this tab, if you maybe undervolt it just a little bit you should be ok. Remember to buy also a psu

because amd catalyst is a piece of crap...  ;D
(never ever turn off a monitor with catalyst, unless you have a couple of hours to lose to put it back on)

edit: forgotten how to do this

450w and 290x is not a good combination to run.

fastest mining ever..
but highest power comsumption ever!!!

hmm not really the 290x is rated 250W, clearly not the highest ever

Depends on your 12v rail(s).  Feed the 290X anything less than 25-30v and you'll get nothing. 

R9280x consumes 350W so 290 needs more to work and hash properly.

If its not working try headless in Linux.

Maybe the card is damaged.

sorry, just not true, I have one...  ::)
people should start to look at the spec. rather than making assumption

i'm using Asus R9280x-DC2T-3GD5 gpuclock:1080 gpumemclock:1600 using catalyst 14.6RC2. so MY card consumes 350W, dunno about yours. 24A at 12Vrail

That card btw had ROI in 3 months and since then all is profit. Was the days were doge had met moon! Epic days!!

R9 280X can draw power from PCI-E (about 75W) and from 6pin + 8pin (175W) or 8pin +8pin (200W), so max consumption is somewhere around 250W.

You can see consumption when mining:
http://media.bestofmicro.com/3/G/404476/original/05-Power-Consumtion-Torture.png

may-be, I don't know, but what you said for the 290x is just wrong. It is a more powerful card than the 280x but the power consumption is smaller...
(and 350W is probably the power drawn by the rig and not the card itself...)

If the card is not getting enough power then the fans will be 100%

Put your ear to the fans and listen.

As soon as you start your computer fans will go to 100%, means low power or no power.

I have ASUS R9 290X taking 350-390W @ WALL with mobo/ram/cpu/hdd
R9 295X2 taking about 670-790W @ WALL with mobo/ram/cpu/hdd

Most likely your power supply does not provide enough power on 12 rails.

Actually the 450watts is enough, but you can only run stock clock.

Wattage tells you nothing. You can have quality 450W PSU with ~450W (be quiet, XFX, super flower, seasonic, some Corsair series...) on 12V or you can have crappy 450W PSU (Lc power, energon...) with 300W on 12V. So quality PSU with 450W could be enough, but crappy can't.

let me tell you my system configuration for this rig

Motherboard: Asrock 990fx Extreme
Cpu : Amd Athlon x2
Ram : 4GB DDR3 @1600
HDD : Sata 250GB

All this powered with a 550Watt Heroichi power Supply.

GPU's : 1x Asus R9-280X DirectCU II TOP  http://www.guru3d.com/articles-pages/asus-radeon-r9-280x-top-review,8.html

Power consumption Radeon R9-280X DirectCU II TOP

    System in IDLE = 119W
    System Wattage with GPU in FULL Stress = 352W
    Difference (GPU load) = 231W
    Add average IDLE wattage ~10W
    Subjective obtained GPU power consumption = ~ 243 Watts

           1x Asus Nvidia GTX550Ti http://www.bit-tech.net/hardware/graphics/2011/03/15/nvidia-geforce-gtx-550-ti-1gb-review/10

               System Wattage with GPU in FULL Stress = 248W

GPU's powered with a 650Watt Heroichi power supply. Using a 550w supply system restarts. So here is my proof that i'm not making assumptions.
Both power supply's are gold plus 80.

So this is exactly what I wrote. Max consumption per GPU alone is ~250W in their test it is 243W.

Sorry for telling you, but this is crap PSU.(http://www.e-shop.gr/heroichi-hc550te-550w-green-80plus-retail-p-PER.700118) Only 28A on 12V, so it can only give out 336W so no wonder that under full load (GPU 250W+ CPU and other devices 100+W, together 350+W, but this PSU can give only 336W) it will restart your PC.
Try buying for example XFX 450W, that has 34A on 12V, so much better than this crappy never heard of Heroichi.

GPU's powered with a 650Watt Heroichi power supply. I assumed you misread the above. The fact you have never heard Heroichi doesn't mean anything. i've never heard XFX .... i'm familiar with thermaltake-hec-corsair-seasonic.

GPU's PS http://hecgroupusa.com/products/switching-power-supply/80-plus/ZEPHYR-MX-650/

Also those 2 Hec are leftovers from previous pc's.

Yes I misread. But actually this changes nothing. 280X stil uses the same, 550ti uses ~110W so total consumption is again over 350W and that is too much for 12V of your 550W PSU.

And by the way XFX is seasonic OEM so uses same parts.
A quote from one of web sites:

One more reference, but you can find a ton of them: http://forums.overclockers.co.uk/showthread.php?t=18346241

So even the cheapest XFX is same as seasonic not like lame Corsair that uses cheap materials for budget versions of PSUs and let buyers think that they made a good deal but actually bought "same shit" as LC Power.

Thanks for the tips m8 :) at least i learn something ;) so the next ps should be XFX!!!

Not necessarily XFX, depend on price in your country and what you need. Some other like "be quiet!", super flower, lepa are also good but not all series.
I am not fan of any PSU just usually take best price/performance, but currently in my PC is XFX 650W that I bought for 65€ and I was running my CPU, HDD, RAM, so all devices and also 1* 280X and 1*270 (mining ofcourse but 1 year ago) both overclocked to 1150/1500 for 280X and 1210/1450 for 270 and hadn't any problems.