Tom's Hardware > Forum > CPU & Components > Power Supplies, PC Cases & Case Mods > Entire System: Phenom 9650+HD 4850 = 330 Watt at most?

Entire System: Phenom 9650+HD 4850 = 330 Watt at most?

Forum CPU & Components : Power Supplies, PC Cases & Case Mods - Entire System: Phenom 9650+HD 4850 = 330 Watt at most?

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d1ve2blu3   06-28-2009 at 05:00:05 PM

Hi All,

Can i put HD 4850 with Phenom X4 9650 in a 400 watt PSU?
I've tried to use some power supply calculators and it seems i can...

The test turns out that my entire system will only needs:

1) 330 Watt http://www.journeysystems.com/psu.php

2) 290 Watt http://www.thermaltake.outervision.com/Power

3) 217,6 Watt - manually calculate it (took the highest range)
http://www.tomshardware.com/review [...] 122-7.html
http://www.tomshardware.com/review [...] 122-6.html

My sys are:
ASUS M2N68-AM+/Patriot 2x2GB DDRII 800/WDC Caviar Blue 320GB/Sound blaster Audigy 4/Samsung DVD-RW/3 Fans+2 USB's

PSU Silverstone ST-400 (efficiency 79.69% at max)
Output: +3.3V@28A,+5V@30A,+12V1@18A,+12V2@18A,-12V@0.5A,+5VSB@2.5A

http://www.newegg.com/Product/Prod [...] 6817256032

But I never feel convinced since the card manucfacturer said that HD 4850 needs at least 450 Watt PSU with 75 Watt 6-pin PCI-e power connector (how can i know the wattage of my psu 6-pin PCI-e connector??)

I don't plan to OC'ing anything &still wanna use my old PSU. So I'd prefer degrading the GPU to a 4830 or even 4670 :(

So, is it safe to go with HD 4850...or not?
any thoughts are welcome :)





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d1ve2blu3   06-28-2009 at 05:36:12 PM
- 0 +

Is this site http://www.hardocp.com/article.htm [...] xoZW50aHVz can determine how many watt ST400 psu 6 pin pci-e connector? it said 80mV...

Reply to d1ve2blu3
theAnimal   06-28-2009 at 09:19:14 PM
- 0 +

6 pin PCIe connectors are all 75W.

How about an HD4770? Less than 1/2 the power for about the same performance.

Message quoted 1 times
------------------------------ *How To Ask For New Build Advice*
HAF 922 | HX750
Rampage2Gene | i7 920 D0 | 6GB Gold 1600 | Hyper 212+
Caviar Black 640GB | HD3870
 Reply to theAnimal
Mondoman   06-28-2009 at 11:37:41 PM
- 0 +

According to the PS label, the total +12V is 29A, not 36A. However, Silverstone is a good quality brand, and the PS does include a 6-pin PCIe connector, so I think you're fine.

Message quoted 1 times
------------------------------ e2160@3GHz: OCing my way to Ubuntuland!
 Reply to Mondoman
d1ve2blu3   06-29-2009 at 04:25:14 AM
- 0 +

theAnimal wrote :

6 pin PCIe connectors are all 75W.

How about an HD4770? Less than 1/2 the power for about the same performance.




I just knew that all 6 PCIe connectors are 75W, thanks! so i guess my 400W psu would be fine...

Yes I've been thinking to 4770 for a while, even the product is a newcomer at my place &overpriced but it still $30 cheaper than 4850 (same brand)...UNTIL couple days ago 4850 dropped price and only cost me more $3 :)

Reply to d1ve2blu3
d1ve2blu3   06-29-2009 at 05:17:51 AM
- 0 +

Mondoman wrote :

According to the PS label, the total +12V is 29A, not 36A. However, Silverstone is a good quality brand, and the PS does include a 6-pin PCIe connector, so I think you're fine.



Is this the correct formula? 29A x 2.59 volt = 75.11 Watt
then even 29A would be sufficient to feed 75Watt HD 4850 6 pin pci-e connector?

Other things that might relieved me is, i used to use Pentium D 820 2,8 Ghz @3 Ghz with this PSU
In TDP stated that Pentium D needs 95W, so is Phenom x4 9650 (TDP 95W)

But when im using this auto calculator http://www.thermaltake.outervision.com/Power (just filling the CPU only)
turns out that Pentium D 820 needs: 134 Watt
Phenom x4 9650: 107 Watt

Is it true that Pentium D is more power hungry? then i can assume, using phenom will saved me more watt so the 4850 will run fine...

Message quoted 1 times
Reply to d1ve2blu3
theAnimal   06-29-2009 at 06:08:07 AM
- 0 +

d1ve2blu3 wrote :

Is this the correct formula? 29A x 2.59 volt = 75.11 Watt
then even 29A would be sufficient to feed 75Watt HD 4850 6 pin pci-e connector?

Other things that might relieved me is, i used to use Pentium D 820 2,8 Ghz @3 Ghz with this PSU
In TDP stated that Pentium D needs 95W, so is Phenom x4 9650 (TDP 95W)

But when im using this auto calculator http://www.thermaltake.outervision.com/Power (just filling the CPU only)
turns out that Pentium D 820 needs: 134 Watt
Phenom x4 9650: 107 Watt

Is it true that Pentium D is more power hungry? then i can assume, using phenom will saved me more watt so the 4850 will run fine...



TDP is not power consumption.

If you haven't already bought the Phenom, get the Phenom II instead.

------------------------------ *How To Ask For New Build Advice*
HAF 922 | HX750
Rampage2Gene | i7 920 D0 | 6GB Gold 1600 | Hyper 212+
Caviar Black 640GB | HD3870
 Reply to theAnimal
d1ve2blu3   06-30-2009 at 06:52:22 AM
- 0 +

I already have the first phenom..
should i forget this 4850?

Reply to d1ve2blu3
d1ve2blu3   06-30-2009 at 06:55:09 AM
- 0 +

Looks like 4670 is the best option...what a way under comparing to 4850 :(

Message quoted 1 times
Reply to d1ve2blu3
theAnimal   06-30-2009 at 03:58:55 PM
- 0 +

d1ve2blu3 wrote :

Looks like 4670 is the best option...what a way under comparing to 4850 :(



4770 also uses very little power. Or even a GTS250 is well under 100W.

------------------------------ *How To Ask For New Build Advice*
HAF 922 | HX750
Rampage2Gene | i7 920 D0 | 6GB Gold 1600 | Hyper 212+
Caviar Black 640GB | HD3870
 Reply to theAnimal
jgmcgowan   07-03-2009 at 01:59:28 PM
- 0 +

I've got an ATI 4850 a Athlon x64 4400 CPU, Sound, TV Tuner, 2 HD's, and 2GB of 666 flash no hiccups on power with the stock HP 330 Watt PSU.

I'm updating the Mobo\CPU this week to something dual x16 capable and probably based on AM3 socket for a Phenom 940 BE

I'm thinking I will need to get a good 800 Watt PSU this time around.

Reply to jgmcgowan
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