Hey guys I just put my 4850hd in last night and was having issues with it overheating. I read that I should install the Asus fan controller to adjust the fan speed and that fixed my overheating problem. I rebooted the computer and now my ethernet port says its "disconnected" and no cable is found. Am I having power issues with my PSU? It seems like when I reseat the video card the ethernet port comes back until I reboot. System specs below, psu is about 2-3 years old. AMD 6000+ Asus M2N-E Asus Radeon 4850HD 2 Gigs of G Skill Ram Thermaltake 420w psu X-fi extreme music sound card
I would say 420watts is a bit on the low side for a HD4850. Try monitoring the +12v, +5v, +3.3v, and The Cpu Vcore voltage whilst under load, if they are well below the proper voltages then Your psu is not good enough.
I'm using a Corsair VX450 450watt. Wattage isn't everything, look at what amps it can deliver it's much much more important. Are you sure it isn't a software problem ? if you disable the Asus program is your Ethernet then up and running ? I'd suggest you update those drivers first before buying a new PSU.
In this case I disagree His PSU is 65%+ that means he gets 273W max on that power supply. That's not enough. Your PSU is 82% efficiency at 100% load. To put this in perspective he would need a 530W power supply to achieve the same wattage as a 420W PSU with your efficiency. Or 570W to achieve as much wattage as your PSU puts out. ETA: The system in the guru3d review requires 269W under load. However, the X6800 extreme is a 75W processor, the Athlon 6000+ is a 125W processor this puts him well over his PSU's limit.
No, a 500watt PSU will convert 500watt no mater if its 65% or 80+%. A 500w psu with 65% efficiency will need 675w to do the right job. 500w at 80% will require 600w. Here's a link HERE Your problem I related with your PSU indeed. I had the same as yours, but I changed it for this Zalman because the Amperage was just insufficient. A card such as the 4850 will require a lot more amperage than older card. Since ATX 1.0 to ATX 2.0+, the requirement in term of voltage are somewhat lessened but Amperage are the big factor for a solid build!
Also guys, his is a Thermaltake 430W with only 18 Amps on the +12V rail. The HD 4850 needs at LEAST 26 Amps.
The 4850 do run hot at the moment as many have observed but there is a nice little fix just here, no hardware modding: http://forums.guru3d.com/showthread.php?p=2751569#post2751569 So once you have your PSU sorted you may want to goto this link and have a look at Bretware's solution, about 1/2 down the page, works a charm.