Do I need a better power supply?

I've had my PC for nearly two years now and considering upgrading my GPU. I purchased a Dell XPS 8500. So far it's been pretty hard to identify exactly what components I do have (brand, model, etc.). Just need some further input on what I should consider.

Here are my specs:

Intel Core i7 3770

AMD Radeon HD 7870

16 GB DDR3 RAM

2TB Hardisk, 32 GB SSD for OS

460W Power Supply

Can't identify my motherboard =/

I'm heavily considering the MSI GTX 970. From what I could find, it seems to pull less power than my 7870 (OEM card I believe). So far I haven't had any issues with my card and power supply, but from a safety standpoint should I reconsider?

What is the brand? and what are the 12v specs how many A does it do per 12v rail? While yes the GTX 970 uses less power then a 7870, I wouldn't want to keep on using a no name psu.

as 04d said its not a good idea to keep using a no name psu.

I'm surprised its not blown out running that i7 and 7870 my no name 500w psu have out on my 8350 7850 combo.

Also MSI GTX970 requires a 6pin and an 8pin PCIE. Does your PSU have 1 6pin and 1 8pin?

Also as @04dcarraher said, brand name will help too.

Your 7870 consumes 40 less watt. But this shouldn't be a problem...

He's fine, only using about max 300w under load.. The no name PSU is Dell's line of PSU, they aren't bad and he has nothing to worry about.

http://www.extreme.outervision.com/PSUEngine

Check what PCIe connections you've got with that PSU and the GPU you intend to buy, 970 by Asus uses only 1x 8 pin connector while others uses 2x6 pin.

I'm paranoid with PSU and often go overkill, I have a 750W XFX PSU now to power my 8350/7850 thats probably overkill.

That's totally normal, the GPU manufacturers make people think this way for legal reasons..

With me it was one bad experience with a dodgy PSU I had, the thing blew up and set a fire inside my PC, you can imagine the sheer panic and terror if you see flames inside your PC.

I put the flames out fast lucky enough only the PSU was broken, and some case fans and the CPU fans had some burn marks on, other that it was a lucky escape.

wowa im running a ocz 600 watt psu on a phenom 2 rig.

@PredatorRules: Checking on that now. Good point to bring up.

EDIT: Looks like I will be taking a look tomorrow. My case has a casing for the power supply, so I can't tell what PCIE connections it has without opening everything up (the wires feed through a small opening). Don't have time tonight so I will take a look tomorrow.

@Coseniath:

Would it be safe to assume from my current GPU whether or not I have 1 8 pin and 1 6 pin? The 7870 looks to be using two 6 pin connections for the power supply.

7870 needs 2 x 6pins. So we can assume that your PSU has 2x6pins. The reference GTX970 uses 2x6pin too. Some non-reference models too.

But The MSI GTX970 uses 1x8pin and 1x6pin.

A good non-reference GTX970 is the EVGA ACX2.0.

It needs only 2x6pins.

You can check other non-reference GPUs but from the reviews I know that Asus Strix has 1x8pin, Gigabyte and MSI need 1x8pin and 1x6pin.

Gallery

@Coseniath:

A better non-reference is the Zotac 970, I had the evga for 4 days and it died, so I'm getting a strix. Also IMO, the Zotac 970's look the best.

Well Zotac doesn't have EVGA's warranty but, I agree its a nice card and its advantage against all other cards is that its smaller and it should be fit to more cases...

Well TC has a XPS, and the last I remember seeing one, they are cramped and tiny inside.

That is very true. It's a midtower case and is VERY cramped inside. I shouldn't have too many issues since the 7870 fits in there nice and snug.