Slowdown games using soft15

[mitsurugi]

Hello!! 
I'm using windows 7 x64 with a hd4850 and soft15.
Windows run in 15hz, but when i try emulators 3d games have slowdown.
I have tested mame (games like tekken tag and psx 3d games), model 3, model 2 and all have several slowdown and choppy sound.
Demul only runs ok.
In monitor computer everything runs ok.
What could it be?
Thank you very much.

[rCadeGaming]

If you're using Soft15kHz, are you using directdraw for native res in MAME?  If so, it's much more demanding than Direct3d, so the slowdown is normal.  You either need a faster processor, or do some compromising with Direct3D for problem games.  Sorry.

[mitsurugi]

I have found problem. I had to disable v-sync and tripple buffer in all emulators and catalyst control center!

[secret80sman]

I have the exact same hardware than you do in every way so will try this. I'm running MAME .140 so what are the d3d compromises to expect if I go that route?

[mitsurugi]

I really don't know what causes the slowdowns but 3d games run very very slowly.
I must disable v-sync and tripple buffer, and games run good in that case, but have several problems wich games like taito typex, because the launcher don't have graphics options and i can't disable it. Example: kof mi runs very very slowly!!
Maybe somebody can tell us where are the problem.

[SailorSat]

What resolution you run the games at?
Interlaced resolutions on ATI can force you down to 30Hz.

[mitsurugi]

In mame i put auto in resolution and in model 2 or model 3 800x600, but always you active v-sync or tripple buffer, slowdown, but the game shows correctly, only very slow.

[SailorSat]

800x600 will be 50Hz, and with that ATI bug either 50FPS or 25FPS instead of 60.

Try 640x480 for model2

[mitsurugi]

Thanks for your reply. This bug only affects ati cards? is there any way to repair it?
I have tried with the house of the dead 3 pc game, and same slowdown. I put resolution to 640x480 and same slowdown. Pc games always slowdown...