XFX HD 4850 1GB GPU!

Hi, I just had a few questions for experienced GPU overclockers.

But first the specs:
Setup:
-Sidewinder 2 ATX case
-PSU: 400w NXZT PF400 (12v rail@20.5a)
-Mobo: Biostar A785GE
CPU: AMD Phenom II x2 550 BE (OCed to 3.6 Ghz@1.375v)
RAM: 2GB XMS2 Corsair DDR2 800mhz
HDD: 200 Gb 5400 RPM
Optical devices: 1 DVD/CD burner (DL)
OS: Windows XP Professional 32 bit running on SP3

System goes around 20c-40c, CPU= 30c-44c~ Idle/Load
Basically I am considering Overclocking my GPU, however I have a few concerns which I can find no data on. Also I understand that my PSU is under the minimal power requirements of the GPU. However when I inputted my setup into the "Power supply" calculator, it came out at 350w~ under 90% load.

1. What is a safe overclock for the XFX HD4850 1gb? Keep in mind I only have 3 internal fans, GPU/CPU/1 80mm front for channeling air in. I hate fans... If keeping it stock is the best option thats fine.
Stock Clock: 625 Mhz
Memory Clock: 1990 MHz

2. Would my 400w PSU handle it an overclock?

3. Would my PSU commit sepukku running this setup, if so can anyone give an estimate?


Thanks in advance! Go go ATI HD 5870!!!
10 answers Last reply
More about 4850
  1. Change ur psu to CORSAIR VX 450 if u are not sure with ur psu
    EDIT: 20.5A is not so good for a overclocked cpu and gpu,and i think the xfx hd 4850 is a powerfull card which can play crysis,gta 4 at maximum without lags!


    with regards!
  2. Like u said earlier, 4850 is a power hungry card, and if u only had 400W then u better get a new one...
    U said that u hate fans, right? So i assume u love HEAT, right.... :)
    4850 is a hot card, when u overclocked, it produce more heat than before...
  3. Overclocking really increases the load your GPU puts on the power supply. If you are squeezing by with a 400W I really would not recommend it at ALL. Your CPU is already OC'ed as it is. I don't think i'd even be comfortable with your current setup. Just my honest opinion.
  4. jay2tall said:
    Overclocking really increases the load your GPU puts on the power supply. If you are squeezing by with a 400W I really would not recommend it at ALL. Your CPU is already OC'ed as it is. I don't think i'd even be comfortable with your current setup. Just my honest opinion.


    I already overclocked the GPU/CPU, and the Power supply is under the efficiency load (278 watts on a 400w 70% efficiency.) Should be fine. Once my new motherboard comes in from RMA I will be upgrade to a 750w for crossfire/raid/hopefully unlocked cores and future overclocking on cpu.
  5. ok, Have a great OC!
  6. Guys please use

    You for 'u'

    and

    Your for 'ur'

    Please guys this is a tech forum , you are not texting your Girlfriend,
  7. Ok...
  8. shubham1401 said:
    Guys please use

    You for 'u'
    and
    Your for 'ur'

    Please guys this is a tech forum , you are not texting your Girlfriend,


    Assuming the posters at Tom's have girlfriends :pt1cable:
  9. Manicslayer said:
    Assuming the posters at Tom's have girlfriends :pt1cable:


    damn it, you beat me to the line!!! :D
  10. okok,Sorry
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