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Help with power requirements for an ATI 4670 inside of a Dell

Last response: in Graphics & Displays
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May 3, 2009 3:30:22 AM

I'm trying to put either an ATI Radeon 4670 or 4650 inside of a Dimension E521 desktop.


I noticed the huge gap in frames per second between these 2 cards, with the only major difference being the power consumption, but the prices of these cards are relatively similar.

My questions are, what are the power requirements for these cards? What does a 12V rail mean? (I'm guessing this is the line in which the card is powered which is a 4 pin) Also, how can I tell by looking at my psu specifications that my power supply has enough volts on the 12V rail to power one of these graphics cards?

Now I understand that the recommended power supply requirements for these cards is 400w, but I feel that's a bit overabundant, specifically for the 4650, as I've read that people have ran this card with 250w power supplies.

Here's the power supply that's inside the Dell I'm trying to upgrade:

Model: H305N-00 (I'm not sure what the form factor is)

Max power output: 305w

AC input 50-60 hz

DC output +5v - / 22A, +3.3v / 17A
+ 12va / 18A, + 12vb / 18A
-12v 1A, +5vfp / 2A

Can someone please explain to me what I'm looking at here and what's relevant for when upgrading graphics cards? :bounce: 

I'm trying to keep my budget under $100USD. So if I end up having to buy a new power supply I'd prefer it to be a cheap one. Also, if I end up getting the 4670, should I get the one with the fan or the huge heat sink?

Input is greatly appreciated! ;) 
May 3, 2009 4:06:01 AM

spellbinder2050 said:
I'm trying to put either an ATI Radeon 4670 or 4650 inside of a Dimension E521 desktop.


I noticed the huge gap in frames per second between these 2 cards, with the only major difference being the power consumption, but the prices of these cards are relatively similar.

My questions are, what are the power requirements for these cards? What does a 12V rail mean? (I'm guessing this is the line in which the card is powered which is a 4 pin) Also, how can I tell by looking at my psu specifications that my power supply has enough volts on the 12V rail to power one of these graphics cards?

Now I understand that the recommended power supply requirements for these cards is 400w, but I feel that's a bit overabundant, specifically for the 4650, as I've read that people have ran this card with 250w power supplies.

Here's the power supply that's inside the Dell I'm trying to upgrade:

Model: H305N-00 (I'm not sure what the form factor is)

Max power output: 305w

AC input 50-60 hz

DC output +5v - / 22A, +3.3v / 17A
+ 12va / 18A, + 12vb / 18A
-12v 1A, +5vfp / 2A

Can someone please explain to me what I'm looking at here and what's relevant for when upgrading graphics cards? :bounce: 

I'm trying to keep my budget under $100USD. So if I end up having to buy a new power supply I'd prefer it to be a cheap one. Also, if I end up getting the 4670, should I get the one with the fan or the huge heat sink?

Input is greatly appreciated! ;) 

Yes, the PSU will be able to handle it, however there "may" be an issue in long term stability.
Keep in mind that you might have to get a low profile card depending on the form factor of the case.
a b U Graphics card
a b ) Power supply
May 3, 2009 4:15:08 AM

Here's a graph that shows the actual power requirements of different graphic cards.
http://forums.atomicmpc.com.au/index.php?showtopic=264
4670 = 47w at load.

The Dell E521-S is the slimline system. Your power supply is just fine for the HD4670 and the 4670 does not require any additional power from your PSU.

Here's 3- 4670s that would be good choices $70 - $80 not counting rebates. A Sapphire 4670 that is only a single slot card, it'll be easier to place in your system and less chance of it blocking a SATA or other port. May be a bit louder and warmer then a dual slot card.
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

Another Sapphire card, this is dual slot, but uses DDR4 memory, it's a bit faster then the DDR3 card.
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

HIS IceQ - dual slot has the best cooling of the 3 cards, exhausts hot air out the back of the case.
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

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May 3, 2009 4:25:51 AM

If you are running a Dell E521 Full Desktop and not a slim-version. The ATI HD 4670 will work perfectly with your PSU.

1. Your computer uses a BTX form factor. So you can only get a single-slot ATI HD 4670 videocard. Do not get a dual-slot videocard or one with a huge heatsink. It won't fit in the case.

2. Your Dell PSU's +12 rails combined is 22A. 264 / 12 = 22. Which is plenty enough for the ATI HD 4670.

a b U Graphics card
a b ) Power supply
May 3, 2009 4:29:10 AM

I have a E521 system and I got a 4650 heavily OCed. You should be fine with either.
May 17, 2009 8:24:56 PM

I'm interested in the 4670 as well, except I have a Dell 530. The power supply reads:

+12V / 18A / -12V
+5V / 22A / +5V
+3.3V / 17A

300 W Max

Anyone know if my system has enough power as well? Thanks.
May 17, 2009 8:34:42 PM

Ok, I didn't type it completely.. here it is:
+12V/18A, -12V/.8A
+5V/22A, +5V/2A
+3.3V/17A
a b U Graphics card
May 17, 2009 9:22:00 PM

Kint said:
I'm interested in the 4670 as well, except I have a Dell 530. The power supply reads:

+12V / 18A / -12V
+5V / 22A / +5V
+3.3V / 17A

300 W Max

Anyone know if my system has enough power as well? Thanks.


If you have the full size 530: http://www.newegg.com/Product/Product.aspx?Item=N82E168...
December 16, 2009 3:00:16 AM

Would it work to just put a 4670 into a 530 slim if I leave the case open? My friend has a 530 and I have a 4670 (replaced it with a sexy 4850 for my computer)

Its a 300w rated power supply.
!