4890 ati strange problem in win7

System is a custom built, with all new components.
CPU: Phenom II X4 955, Rev C3
MB: Asus m4a79xtd evo - 790x Chipset
RAM: 2 modules, Kingston KHX1600C9D3BK2/4G 4GB DDR3-1600Mhz
PSU: Lc-power 600 w
GPU: PowerC Ati radeon 4890 1gb ddr5

So the problem appeared when I installed win7 64bit. No problem what so ever on XP.

The games runes about (50-100) fps depends on the game, with apsolutly no lag but accompanied by some a kind of jerky motion. Some kind of frame problem. Relay i don't know how to describe it.I tried to reinstalled (formatted) the whole system. fresh drivers for the motherboard and graphics and still nothing.Updated my bios. Tried win7 32bit to. But when i downgrade to Xp, problem simply disappears. Does anyone know what the problem is and how to solve it? ...i don't want to return to Xp again

when I use XP, games like Battlefield BC2 works normal with the new Catalyst drivers. But the games such as GTA4 lags horribly. I solved the problem in XP (with GTA4), by rolling back to older version of catalyst. And with that older version every game works just fine, with high frame rates and no lag ...and without this kind of problem that i have on win7. On the other hand in win7 i have new catalyst driver no lags in games, high frame rates but i have this strange motion problems like missing frames or something ( its like "teleport" effect, when you are going forward ), overlapping frames...and all of that at frame rate of 80?
Its weird and i cant determine the cause of it?

Are these online games or local single player?

local.....i have .choppy gameplay despite high fps...... but when i run some background process like fraps ( movie capturing with f9 -function on ) that lower frame rate in game , problem disappear . How strange is that ??

Replace the cheapo PSU, then run Memtest86+ and schedule chkdsk.

baron75mk2 said:

just wondering when you say games running at 80 - 100 fps are you using v-synch (wait for vertical refresh) or does your monitor support inputs of 100hz ? i find if i dont use v-synch i get the same issues - i get phenominaly high framerates but because the graphics card & hdtv/monitor are not syncroinised properly i get the teleport effect you discribed & the ususal screen tearing as well - so these days i just have v-synch enabled & run at 60fps/60hz ( highest my hdtv supports) with no issues apart from far cry 1 which i still get the teleport issue with but this is due to the game being so old & not really compatible with the newer cards/drivers

wait ?
my monitor refresh rate is set to 60hz?
i tried to enable Vsync from CCC and from the game and still nothing ??
Yes in the game i have high frame rate, i dont know how ?
Can you enplane me what to do ???

Frostmourne said:

Replace the cheapo PSU, then run Memtest86+ and schedule chkdsk.

why do you think is PSU ??
Everything is normal in xp , only in win7 i have problem.
600w is more than enough

vlajko80 said:

ok so , according to this Thermaltake Power Supply Calculator
i need a 350w psu ?

Cheap PSU's can have all kinds of screwy issues.