Hi to everyone. I recently bought a used ZOTAC GTX570 and I mounted on my old system but it doesn't work: it seems there's no power supply. Monitor is black and I notice that not all fans of my system work like a lack of power. But GPU turns on because I notice that its fan works.
I need some advice to understand what it could be my problem because I don't trust at all about seller.
My other specs are:
CPU Q9300
RAM 2x2GB DDR2
1 HDD
1 DVD/RW
4 STANDARD FAN

Question is: can my psu (Cooler Master RS600 ACAB D3) handle this system? And, if it's not, why.

The power requirement state 600W for the videocard so that's a bit close with what you have, might opt for a 700W to be safe.

Still, this should only be a problem under load, like while playing a game that is demanding of the gpu.
You should be able to boot your pc even with an inadequate psu, so my guess is that the videocard is kaputt.

Maybe try it in another pc if possible.

I think they usually seriously overstate the demand.

Psu calculator says 450W, so yeah. :)

All that hardware you have there is quite old. It is quite likely that something of what you have is simply broken.
Especially powersupplys can degrade with age.

Do you have another graphics card or powersupply to test?
Does your mainboard have any kind of diagnostic LEDs or a buzzer? Those might give you a clue whats going on.

You still want some headroom for peak loads.
And not to forget: the power supply isn't supplying the graphics card only...

I mean they're seriously overstating it ever considering peak loads. It's very much a cover-your-arse kind of statement, which they most likely do so that they can disclaim liability and reduce support expenses when it comes to dumb users who do not understand power requirements at all. It's easier for them to tell the users to buy a PSU that is more than sufficient for 99% of the builds by casual users (accounting for all the components, not just the PSU), than it is to explain how the power demands of a PC work.

The end result is that casuals are now buying 1000W PSUs that run at a max 30%-40% load when pushed to the limit and 5% when idle, resulting in poor efficiency. That's both a waste of money and waste of electricity. Most casual PC builders also have no idea where their PSU is at its optimal (hint: it's not when it's running below 50% load).

Is it a "true" 600W power supply? (I didn't look up the stats for that PSU) - I know when I had my 660 all reports said you'd want a "true" power supply - I think it was supposed to have (and I'm sorry if I get the terminology wrong) 2 12 V rails or something like that - not all power supplies send out ideal power on both rails if they're not both 12 V or whatever it was supposed to be.

Also, I *think* my 660 needed TWO 6 (or was it 10?) pin connectors - did you connect both? Did you maybe use an adapter for one of them - as not all PSUs have 2 six pins and sometimes need an adapter to convert one of the pins - maybe that's the issue (and why you're getting fans on the GPU spinning up, but not actually enough power to power the card's functions).

I know that it's old. Now I'm on the same system with a 9800gt and everything works fine. Before I bought the 570, I had a GTX460 which broke while I was playing at a modded version of S.T.A.L.K.E.R. SoC (S.T.A.L.K.E.R. mod compilation 1.3). I don't know about diagnostic led and what is a buzzer. My motherboard is a Gigabyte EP45-DS3R.

I don't know but before buying this card I checked some sites calculating power supply and in the worst of cases the number I got was near 450W. My knowledge about PSU is not so deep but I can write down what's written on mine, maybe it can help:
+12V +5V +3,3V -12V +5Vsb
47A 20A 20A 0,3A 2,5A
564W 120W 3,6W 12,5W Yes I connected both

You are going to be OK with that configuration BUT in case of future upgrades you may want to get a better one.

The 600W requirement is a general advice to a wide range of people who may as well as have quality PSUs or bad chinese no brand ones.

Good PSUs are overbuilt in a way that they can give to your hardware all the power it asks continuosly and down the line.

Edit 2:
OK Ive found the Specs sheet: the PSU has a single 12V rail which can provide up to 564W so you are definitely good, next time you shop for a PSU you might want to buy a quality one.

47Amps on the 12v rail is more than enough for your setup.

What kind of GPU were you using before the Rx570?

If was the integrated one, then make sure the option on the bios is set for the Pci-e GPU.
Also make sure you connect the screen cable to your GPU.

Edit: I believe there was some compatibility issue with old core2duo/quads (socket 775) and some newer GPU's but I used my Rx480 on both a phenom x4 and a core2quad q6600 Forget PSU calculators, they mean nothing.

The power requirements that graphic card manufacturers mention take in account that you might have a crappy cheap ass PSU (that can be found in many OEM PCs).
I have a Corsair RM550x (550W) and it can even handle an RTX3070 (+i7-6700, 5 hard drives,...). (The 3080 might be pushing my luck, but it doesn't matter, I never spend that much on a GPU anyway).

So, the system works with another graphics card. Do you know for sure that the GTX570 is working?
If the GPU has an extra PCIe 6 or 8 pin power connector, have you plugged the PSU in?
Does you PC beep when you switch it on? A short beep means everything is ok (so far), but any other beeping will mean something is wrong.