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power supply and HD4850 Question

Last response: in Graphics & Displays
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June 21, 2008 12:11:03 PM

I was wondering if I could upgrade to a HD4850 without upgrading my power supply. I'm using an Ultra X-Connect 400 watt modular power supply but the requirements say you need at least 450 watts.

So can I keep my same power supply?






You should be able to see my computer in my profile if you need to.
June 21, 2008 12:51:16 PM

How many volts on the 12volt rails? This is more important than the wattage.
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June 21, 2008 1:17:19 PM

slashzapper said:
Hey i am sorry dude you are going to have to get a new power supply ,


this one only has 20 amps on the 12 rails, it wont do

get something like this
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

i have this one it can run 2 cards very easily , plus its got a rebate on it ..you cant go wrong

That depends. You said rails. If it's only one rail at 20 amps, it's not enough. If it's 2 rails at 20amps each, it is.
June 21, 2008 1:18:05 PM

What are your specs. It probably will play but the psu life will shorten.
June 21, 2008 1:22:32 PM

His old one is 20amps on a single rail = not good ,

The corsair is 52amps on single rail=2 cards fire power for $99
a b U Graphics card
a c 139 ) Power supply
June 21, 2008 1:24:34 PM

gridener said:
Ultra X-Connect 400 watt modular power supply

If the data plate on your PSU looks like this:

your PSU is only providing 16Amps of +12V power. Not enough for the CPU and 4850 video card.
June 21, 2008 1:31:10 PM

Bottom line you need to buy a new PSu.
June 21, 2008 1:35:59 PM

Alright thanks guys for your imput. Looks like I have some shopping to do! :) 
a b U Graphics card
June 21, 2008 1:36:49 PM

look if you can afford the video card then you can afford the power supply!
Like why ask if a 400 watt power supply is good enough if it clearly states on the box 450 watt power supply minimum!
a b U Graphics card
a c 139 ) Power supply
June 21, 2008 1:51:52 PM

johnnyq1233 said:
Like why ask if a 400 watt power supply is good enough if it clearly states on the box 450 watt power supply minimum!
It's not that cute and dried. There are many good 400W (and even some 350+W) PSUs that could handle a 4850 video card. It all depends on the actual power the PSU can provide and the total power draw with the 4850 in that system. An E2180 CPU will draw a lot less power than an OC'd Q6600 for example. Some people will have several HDDs and optical drives while others only have one each.
It was a fair question.

Here is the 4850 power draw with a Core2 Extreme X9650 3.0Ghz CPU

from: http://www.extremetech.com/article2/0,2845,2320905,00.asp
a b U Graphics card
a b ) Power supply
June 21, 2008 2:01:53 PM

The single 4850 draws more then double the power at load than BOTH of your old cards in SLI did.
http://www.atomicmpc.com.au/forums.asp?s=2&c=7&t=9354
If you get the 4850 you won't be able to use it for future SLI though, you'd need a Nvidia GPU for that.
a b U Graphics card
June 21, 2008 3:59:44 PM

mihirkula said:
This Corsair 750tx is an even better deal than the one mentioned above.

http://www.buy.com/prod/corsair-tx-750w-atx-12v-power-s...

$100 for a 750w corsair is brilliant.


And It was tested by [H]ardOCP and passed every test

Quote:
The Bottom Line

With the Corsair TX750W, Corsair has set out to raid the high end market and with the TX750W they have fielded a good candidate. The TX750W makes a very good follow up to the HX line with amazing 12v voltage regulation, good efficiency values, great build quality, good DC output quality, and quiet operation. As always there is room for improvement as we saw less than stellar regulation on the 3.3v rail, a bit noisier than previous Corsair unit’s DC output, and some cooling that could use a bit of tweaking. However, coming in at a lean $179.99 at Newegg this unit is prize booty.

The Corsair TX750W represents a solid PSU value for those that need a lot of power. It is a good power supply, just not a great one.
!