[Help] PPSSPP Run smooth on Acer i3-hd4000, but struggle with desktop GTX660TI

[ifourtos]

I run on 3 different machine :

Acer Aspire v5-431G
i3 1.8K, HD4000, 8GB DDR3
Win 8.1 64Bit

Gaming Rig
i5-2400, 8GB DDR3, MSI-Z77MA, GTX660TI 2GB DDR5
Win 7, 64Bit

Old Gaming Rig
E7200, 4GB DDR2, Gigabyte P45-UD3R, AMD HD5670 1GB DDR5
Win 7, 64Bit
--------------
* All stock clock.
* Playing Resolution = 1920x1080 ( Acer Laptop connected to a FHD Asus 24 IPS )
Game Use, Tactic Orge : Let Us Cling Us Together.
* PPSSPP Gold 0.9.8

PPSSPP Setting : All default.
No Frame Skip, No VSYNC, Buffered to Memory.

Result :
Acer Lappy = Butterly Smooth. Unthorrtle Works like a Charm.
GTX660TI = max 50 fps, no more. After press unthorottle, it even more lag, sound cracked even released unthorottle button......
HD5670 = 52-54 fps max, Press Unthorottle, nothing happen. eventually look lagger afterwards.

I have purchase PPSSPP Gold. So far it get the job done very well.
I just could not imaging, why it cant work well on Overpowered Machine...

Unthorottle is very usefull.

** I found that very weird, the more i press unthorottle, the game become even lagger ( on GTX660ti.. )

I wanted to play on my desktop. My Lappy temparute goes high and its not intended to play game.

Thanks for any help given. I need it. thanks.