A 450W power supply would suffice. The Cooler Master GX Series power supplies are not recommended due to quality issues, so do remember to avoid them.

Suggestions :

Low-Budget :

FSP Hexa 500W - RM159

Moderate-Budget :

Silverstone Strider Essential 500W - RM219

Big-budget :

Corsair GS 600 ( 600W ) power supply - RM299


If you decide to go with the 600W power supply, it should be able to support more PC components that are coming out in the near future compared to the two power supplies of lower capacity.

That's an alternative . The GS 600 is recommended over the Xigmatek 600W Bronze power supply though, as it has a stronger 12V rail ( 576W versus Xigmatek's 504W )

You can consider the Corsair HX 650W power supply for RM499.

A used Intel Core i7 860 wouldn't fetch much nowadays since the moderately cheap and outstandingly cheerful Intel Core i5 2400 that's only RM549 will beat it.

The highest you'd probably be able to fetch with it would be anywhere between RM300 ~ RM400 if it's within a year to a year and a half old. But a lot of people are still ill-informed of the huge improvement in the newer Core i5 processors so you can probably use that to your advantage, though it'll be better if you're honest.

Though the best load for a power supply would be within the range of 40 ~ 60%, 85% should still be within its limit. A good power supply will probably do the job well while a lower quality power supply may give out quicker than it should.

And yes, some PCs do reach to 90 ~ 100% load but that depends on what parts are you using. If you are still using a single core or a low-mid end dual core processor this days with a modern operating system and et cetera then the chances of it being loaded close to maximum load or maximum load is higher than people who have a fast-dual core / a quad core.

Anyway, as for how long a PC would stay at 90% ~ 100% load, that is impossible to tell since it depends on what is the user doing and when is he going to end the task that is taking up a lot of the processing power.

It's hard to tell since we won't know the exact load your PC will be running at.

Anyway, yes, a 650W power supply will do for that setup.

Was the buzzing sound very loud or was it noticeable only if you placed your ear next to the power supply?

Its specification doesn't look impressive to be honest. 516W on its 12V rail on a 650W power supply and only a single PCI-E 6 pin cable? That's rather weak. Aesthetic wise it also doesn't look good. I'd suggest that you give this power supply a pass.

A 500W power supply will suffice but a 600W power supply is recommended for long term usage.

A 500W power supply will do fine for a HD5770. You can even go with a 400W power supply as that will support a HD5770 too without any problems but to be on the safe side a 500W power supply is recommended.

Have you tried jump starting the power supply?

You can test the power supply by taking it out from your system, plugging some fans to it via the molex connector, and then jump-start it by connecting a piece of metal wire from a green wire to a black on the 24 Pin. If it's unable to start, its LED light beside the power switch should light up, indicating that there's something wrong with the power supply. But if the LED doesn't light up and the fans do not run when you try jump starting the power supply, then it looks like your power supply is indeed dead.

The Seasonic X-560 is the power supply you should get if you do not need a 650W power supply. The X-series power supply from Seasonic is a premium series, and has received excellent ratings before.

Well.. As far as I know the Seasonic X-560 is in its own league, but that's for this country.

There's the KingWin 550W power supply that is however, better than the X-560, albeit with a slightly smaller overall capacity. Unfortunately it's not available here.

Well, it is probably also the best power supply available here in the 600W ~ 700W range. In the 700 ~ 850W range however, there's the Corsair AX power supply series which is well, identical to the X-750 and X-850 as the AX power supply series is actually derived from Seasonic, albeit with a different logo. However, if I remember correctly, Corsair is offering 7 years for the AX power supply series, which is 2 extra years over what Seasonic offers for the X-750 and X-850 .

That applies for here only, and you can deal with the manufacturer themselves directly, though postage cost would probably cost a lot, but it would be better than buying a new power supply entirely.

The distributor here is only offering 3 years of their own warranty here. If you want to send your power supply after its warranty here "expires", then you will have to contact the manufacturer instead for help.

You can consider the FSP Aurum Gold 700 for RM489 from ALL IT, or the Corsair HX650 power supply if you prefer a modular power supply. Both will support a GTX570 fine and should do well too with two GTX570s.

What is your current chassis?

Usually there is still some amount of extra space when a power supply is installed in the chassis. The Gigabyte PoweRock 390W will most likely fit into your chassis as it's just 10mm longer than your current power supply.

You might want to confirm though by taking out your current power supply and by observing the design of the power supply area.

The Gigabyte PoweRock 390W is 10mm smaller in width. If a power supply with an extra 10MM width can fit into your chassis, why can't it?