whats your budget for cabinet + PSU ?

You dont want a dedicated GPU?

If no gcard, then APC 800VA wud be more than enud, and a VX 450 too wud be more than enuf.

Originally Posted by DevinWolf

whats your budget for cabinet + PSU ?

I have edited my original post to list my budget - 55-57k and I already have dedicated GPU currently nvidia 8800 GTS but will upgrade to ATI's 4890 in couple ofmonths

^^ I believe 55K is the budget for whole rig. I will suggest:



- APC 650VA around 3K. This will output 390W power, enough for rig with a 4890 in it. At load your system will suck around 350W (actual power drawn by your SMPS with its around 80% efficiency) but that is at LOAD. On average your usage will be around 220W at best (including power drawn by monitor). Of course if you don't want to take chances, step up and go for APC 800VA around 5K. But that will add to your budget.



I use 650VA with Real Power Pro 550W (Active PFC) and it's rock solid. Though there is no guarantee that there won't be a buzzing with an Active PFC SMPS, the chances are very slim.



- Look for at least a 550W SMPS. Cheapest option for you will be SeaSonic S12II 500W that is available in TE market for around 5K (keeping in mind your planned Hd 4890). Of course you can also go for Cooler Master RP 550 OEM if you can find it for around same (or slightly lower) price. Other good 550W SMPS are priced around 5.8K (RP 550W and Corsair VX550)



- For Cabinet, cheapest that I will suggest is Antec 300 around 3.5K but with a 4890 in it, it could be a little cramped. Better options will be CM 690 @ 4.2K or NZXT Guardian around 4.5K

In actual case, the power drawn from the socket is much more than the real power consumed by the system. PSUs being just 80% efficient actually mean, it can provide 80% of the AC power drawn into usable DC power.

That means if your system consumes a total of 400W at peak, then it draws 500W from the socket, ir the UPS here.



You can use the extremeoutervision's PSU calculator to calculate your estimated power requiremtnts, and choose a PSU accordingly.

Btw, a good quality PSU can deliver much more power than rated.

for example the VX 450 delivers almost 570W, Antec EA 650 delivers 750w and so is the GP GA 650AA. And all this without noticeable noise in the output waveform, and still being 80% efficient. SO if the PSU calculator says 550W estimate, look for a good 500~550 W PSU, coz the estimated power is the maximum ur system wud consumes if all components are stressed simultaneously, that wont occur in normal situation. And in case you add some components, the PSU can easily take slight overloaded situation, provided your PSU is a good make.

^^

In actual case, the power drawn from the socket is much more than the real power consumed by the system. PSUs being just 80% efficient actually mean, it can provide 80% of the AC power drawn into usable DC power.

That means if your system consumes a total of 400W at peak, then it draws 500W from the socket, ir the UPS here.

That's perfectly right.

You can use the extremeoutervision's PSU calculator to calculate your estimated power requiremtnts, and choose a PSU accordingly.

That outervision thing just gives you an idea. But because most people tend to take it seriously, it inflates the power figure, just to put people on safer side. There are better ways to calculate the power.

Btw, a good quality PSU can deliver much more power than rated.

for example the VX 450 delivers almost 570W, Antec EA 650 delivers 750w and so is the GP GA 650AA. And all this without noticeable noise in the output waveform, and still being 80% efficient.

Often true but no guarantee and you can't really bank on this "extra" juice

SO if the PSU calculator says 550W estimate, look for a good 500~550 W PSU, coz the estimated power is the maximum ur system wud consumes if all components are stressed simultaneously, that wont occur in normal situation. And in case you add some components, the PSU can easily take slight overloaded situation, provided your PSU is a good make.

Not at all true. If you know that your actual load is going to be 500W, even if only at full load, don't settle for any SMPS that provides less than 600W (correctly specified). But as I said earlier, outervision thing inflates the power draw.



The figures that I estimated in my post earlier were based on what my rig (E7400 @ 3.6 GHZ+HD 4850 @ 735/1000 and two hard disks + 4 120mm fans+ 22" monitor etc) draws at load and idle as shown in the APC Powerchute, that is the power draw after taking into account the efficiency of PSU. The figures, if you are interested are around 160W at Idle and 255W at load from the UPS



I made a very rough estimate for power that OP's computer will draw from UPS with a 4890 in it, but I believe that it was still closer to the actual than the one specified by outervision.



OT: @ dOm1naTOr, there was nothing particularly wrong with your post, but with all the outervision thing going on in the forum, I thought I need to put what I felt in writing.