Underclocking and undervolting R9 290X?

[Ground]

Hello, I suppose I have an issue here - as a friend of mine has lost some cables from his modular power supply, he can't yet replace his GTX 670 which I would be getting otherwise. As my power supply should be able to just about handle it, he handed me a R9 290X Lightning (another hand down from another friend) for the time being. Now the issue - I don't want to risk anything with my PSU, so I would like to undervolt and underclock the GPU. Is that easily possible, or can I expect some issues? Or should I just keep my GTX 560 for a couple more weeks? Or should I just stop worrying and start again once I run into actual issues?

 

Hardware:

Xeon e5649 @4 GHz (6 core) + EKL Brocken Eco

MSI x58 Pro-E

6x4GB DDR3

R9 290X Lightning

Samsung 840 Evo 250 GB 

250 GB Samsung 7.2kRPM HDD (could live without this, but I doubt it'll make a relevant difference with power consumption)

Asus Xonar DGX (could live without this, but I doubt it'll make a relevant difference with power consumption)
Be Quiet! Pure Power L8 530W modular power supply
Case: top of the cardboard box the board arrived in, at least for now (have some plans for that)

[The Sloth]

4 minutes ago, Ground said:

Is that easily possible, or can I expect some issues?

it will depend on you, do your research, you will be fine. 

 

4 minutes ago, Ground said:

should I just keep my GTX 560 for a couple more weeks?

if you don't want to risk it this is the best solution. 

5 minutes ago, Ground said:

should I just stop worrying and start again once I run into actual issues?

go for it, do your research first. 

[Jurrunio]

I don't think you need any detune for a r9 290x to run with your system, and it will be a nice upgrade to both performance and heat output. Just make sure you don't overclock the card.

[xAcid9]

Just use MSI Afterburner and move the slider, as simple as that. Your PC will probably freeze if it too low but that's ok.