GTA 4 lag!!!

[Lazar_99]

Hello. GTA 4 lags bad on my PC since i upgraded from a GeForce GT 240 to a Radeon HD 6850. with the GT 240 i usually got 25-30 fps on 1920x1080 and since i upgraded to a R 6850 i get random chopping every few seconds and the frame rate won't rise above 20 fps. All latest AMD drivers installed and all nvidia drivers deleted. Other specs: AMD Athlon II X3 455 CPU
8gb of DDR3 RAM
Biostar N68S3+
Chieftec 500W PSU
Seagate barracuda ST3-blablabla 500GB HDD 7200 rpm

 

[AntiZig]

either your gpu isn't getting enough power (possible since you got some crappy brand PSU) or your game isn't actually using the GPU at full capacity

 

[Lazar_99]

either your gpu isn't getting enough power (possible since you got some crappy brand PSU) or your game isn't actually using the GPU at full capacity

why is chieftec a crappy brand? the PSU has 20 amps on both 12V rails

 

[Lazar_99]

either your gpu isn't getting enough power (possible since you got some crappy brand PSU) or your game isn't actually using the GPU at full capacity

Well actually i ran a stress test with furmark with 8X MSAA and 1920x1080 resolution and the test was completed successfully with no shutdown. average fps was 25

 

[AntiZig]

What's your CPU then? compare your settings to what you had before, might be bottlenecking there and holding the GPU back.

Chieftec is a brand that I'm hearing about for the 2nd time, and I haven't seen any reputable reviews stating that they are good. Just because it's got 20a written on the label doesn't mean that holds true.

regardless, check the utilization on cpu and gpu. check to make sure you don't have some power management software limiting the performance (set windows power to full performance). GTA is CPU bound, so it wouldn't surprise me if your CPU is overstressed

 

[Lazar_99]

What's your CPU then? compare your settings to what you had before, might be bottlenecking there and holding the GPU back.

Chieftec is a brand that I'm hearing about for the 2nd time, and I haven't seen any reputable reviews stating that they are good. Just because it's got 20a written on the label doesn't mean that holds true.

regardless, check the utilization on cpu and gpu. check to make sure you don't have some power management software limiting the performance (set windows power to full performance). GTA is CPU bound, so it wouldn't surprise me if your CPU is overstressed

hehe that's what i'm afraid of my CPU is an AMD Athlon II X3 455 CPU 3.3 GHz
though i think its a bottleneck or just the CPU can't handle the game that well. but its kinda weird because all other games run fine even battlefield 3 ran perfect. and about the chieftec brand it may not be popular in U.S but here its one of the best brands we have. this 500W PSU cost me 50$ and most 500W psu's are 35 to 40$

 

[AntiZig]

where is "here" if you don't mind me asking?

get a program like hwinfo or hwmonitor to monitor your sensors and loads, most of the time the picture it paints is pretty good to determine if there's a bottleneck.

 

[Lazar_99]

Best answer selected by Lazar_99.