HELP gfx sloww down on new setup

[sigee]

Hi.
Im having problems with gfx slow down.It started when I purchased a new mobo.After a few minutes playing bf 1942 or ms rallisport the gfx become very jerky and my cpu useage goes to 100%.If I ctr/alt/del out of the game and then back in I can play again for a while untill it starts to jerk again.All my games were running fine on my old esc g7s5a.
Please help its driving me mad because I know my system can run these games.

Windows XP Pro O.S.
Athlon 1700+ xp
Gigabyte ga7va
Inno3d Geforce 3 ti 200
512Mb pc2100 ddr (2x256)
Onboard sound
Medley ata133 raid pci card
2x 40Gig 7200rpm oem udma133 ide drives
30gig 5400 udma 66 maxtor ide drive
Old 56k modem
Old cheetha 10/100 lan card
450Watt psu
Old server case with loads of fans

 

[deathstar13]

when u replaced the mobo did u do a fresh reinstall of windows?
this is necesary especially when change in mobos use differant chipsets.

 

[sigee]

Hi deathstar13.Yes I did a complete reinstall of windows xp pro including sp1.

 

[Captain Slug]

What kind of cooling do you have for your Processor? Is your video card receiving ample air circulation?

If it's a time based slow down it's caused by heat 80% of the time.

 

[sigee]

Hi captain slug.I dont think its a heat problem as there is loads of air being blasted around my system and the temperature readings are fine.Something is loading the cpu during games and slowing things down.If I close down some processes it speeds up again for a while.I am completely stumped on this one.

 

[john240sx]

are those the only two games that happens on?
i know a few people that has that problem with BF1942 & MS Rallysport.

 

[Captain Slug]

goto the start menu > Run
type MSCONFIG
hit ENTER
got the Startup tab

Now disable ANY program that isn't vital (Taskmonitor, System Tray, HIDserv)

then reboot

 

[sigee]

Been there done that...but please dont stop the suggestions,your bound to come up with something I havent thought of sooner rather than later (I hope)

 

[Ugmore Baggage]

Here's a few
Check that your AGP is actually working at 4X
Check the mobo battery is fresh (okay that one is silly)
Did you adjust AGP aperture to something outlandishly small or large?
Are you running the games at high resolutions with current patches?
Are you up to date otherwise on patches?
Are your sound settings maxed out? Onboard sound could cause the CPU to max out.

 

[Captain Slug]

A few final things to try

1. completely disable the sound in the game to see if it effects performance drastically
2. Try reinstalling DirectX 8.1 sometimes new game will screw up the directsound drivers.