Do I have the correct power supply for upgrading my graphics card?

Thanks for the quick reply. That does answer my question well. I haven't tried it yet though, I may reply again when I have, but if you feel like going for a bonus, a picture of the correct connectors would be extra helpful, either an image or a link, again thanks.

I have just checked, and it is actually a 750W G7 modular power extreme, or at least that is what it says on the side, thanks.

Again that is very helpful thanks. I'll update this thread with the results once I've assembled the parts and tried it, for anyone else who is interested.

Ok so just an update of sorts. I've managed to get hold of a female to male 6 pin to dual 8 pin connector cable (which can adjust to 6 pin) to connect the power supply to the new R9 290 card. I just wanted to check if its ok to just plug the female end of this cable into the male end of the current 6 pin cable that was connected to the old HD7850, and then plug the dual male pins to the new R9 290. I am unsure if there is going to be an adequate supply through the cables if I simply connect the old power cable to the new graphics card by connecting through with a split connector cable.

Thanks for getting back. The computer I am using was not built by me and so I don't have any of the spare power connectors, only the ones currently in it including the 6 pin which is currently connected to the HD7850 card. I do have the female 6 pin to dual male adjustable 8 pin connector, I'm just wondering if that would be acceptable to use. Here is an image of said connector if it helps:

http://ecx.images-amazon.com/images/I/415fSHLtEdL.jpg

Hi its me again, another update. The new R9 290 card had finally arrived, couldn't fit it my case so I bought a new one, and as I was refitting my computer I discovered I did actually have two adjustable 8 pin connectors from the power supply, turns out they are along the same cable, before I just assumed they would be on different cables. The back of the box which the card came in states that a 750W power supply is required assuming the other components do not require additional power, since I don't overclock any components or do I have extras of things, I can probably assume the power supply is indeed sufficient and I should be able to power the card from the one cable with one 6 pin and one 8 pin connector along it.

New problem now, the adapter plug I used to connect the old HD7850 to my monitor cable is not compatible with the new R9 290. So does anyone perhaps know of any good adapters I could use to connect the MSI AMD R9 290 to my what I'm assuming is a VGA 1920x1080 monitor while still producing a full HD image from the card. Thanks.

Thanks again for a quick reply. So I had a closer look at the back of my monitor and I do have a DVI-D port as well as a VGA port. Currently I have the monitor connected to the AMD HD7850 through a VGA cable with a female VGA to male DVI-I adapter, and I have had a good 1920x1080 picture produced from that.

The new card has DVI-D ports and no adapter plug or such came with it. So now I assume I need either a new DVI-D cable such as this

http://ecx.images-amazon.com/images/I/61aj81DmuIL._SL1200_.jpg

or a VGA to DVI-D adapter plug such as this

http://ecx.images-amazon.com/images/I/61e2sAd5MaL._SL1500_.jpg

I don't suppose you have any idea as to which solution would be best? I have read some things on how VGA to DVI-D adapters don't work well for HD 1920x1080 image but I'm not sure. Again thanks for your help.

Okay, final update (hopefully) on this thread. So I've managed to install the new MSI AMD R9 290 into my computer, after having to buy a DVI-D cable to connect the card to my monitor, it works, so here is a list of the things I have learned during the process for anyone else having a similar issue:

First check if you have the correct power supply, this information was not not displayed on the amazon page which I bought it from, so I of course came here to find out. The back of the box said it requires a power supply of 750w assuming other components in the pc require the standard amount of power.

Check if your case is big enough to fit the card. This card was about 27cm, which I optimistically assumed would fit, it didn't so I bought a new case and re-fitted my computer, which took all of one afternoon.

Also check that you have what you need to connect it to your monitor. I had from the previous card I use a VGA cable with a VGA to DVI-I adapter, this new card require a DVI-D connection, so I bought a DVI-D cable to connect it to the DVI-D input which fortunately I had on my monitor, no cables or adapters came with the card.

The final big hurdle will be installing the software drivers for it. The card came with a CD with all the relevant software, most of it I was unfamiliar with, but I now have the MSI Gaming app and the MSI Afterburner, the gaming app allows you to change operating modes for the card such as 'silent', 'gaming' and 'oc mode', the afterburner seems to be some performance monitoring software which also includes benchmarking and recording software I think. I am unfamiliar with these things as I've said, and I'm not really sure if any of them are necessary, since I already had AMD catalyst control center installed from the previous MSI AMD HD7850 card, if anyone has any thoughts or experience with any of this feel free to weigh in.

After all that I ran some games, according to the benchmark that come with Tomb Raider (the reboot from a year or so back), I achieved an average of 60fps. Then running fraps with Far Cry 4 on ultra settings I achieved about 60fps with a dip to 30fps in some graphics heavy moments, the old card produced 30fps tops, so this is an improvement, although I was expecting the card to be running between 50fps and 60fps constantly. I had achieved 30 to 60fps when running the 'gaming mode' through the gaming app, and I did get about 50 to 60fps when running the app in 'oc mode' although I'm unsure as to what that really did, and my computer was spitting out a lot of heat during the game running. Again if anyone has any thoughts on that let me know.

Big thanks to the people on this thread who have helped me out, if anyone has an idea of what the best software settings are or anything feel free to chime in, next time I feel like upgrading I think I'll just get a PS4 or something. Thanks.