Geforce 8 Shaders OC'ed without BIOS Flash?

I'm starting to think that Geforce 8 shaders can be easily OC'ed without a BIOS flash, just earlier I was wondering what my card's best stable overclock would be (Running it on stock atm) and these were my findings using Rivatuner and Atitool.

Stock

http://img115.imageshack.us/my.php [...] derwc6.jpg

OC'ed

http://img388.imageshack.us/my.php [...] derss7.jpg

With rivatuner's monitor I got a reading of not only Core clock and memory clock, but also Shader clock, and when I increased the core clock the shader clock also increased, which leads me to believe that in order to OC the shaders all I had to do was standard overclocking... Could someone shed some light in this? to this day I only thought this was possible using nibitor.

On a side note, I'm thinking that a 650/950 OC on a GTS 320 is pretty decent right? I didn't try OC'ing it until now that I was just really bored.

EDIT: And in case anybody is wondering, the reason I use Atitool for OC'ing is that I like it's interface and features a lot better than Rivatuner, on the other hand I also prefer Rivatuner's monitor for fan speed and temperature.

I did not know that, I thought it was only possible through NiBiTor... thanks haha...