PS3 slim fan speed

I had PS3 slim slim 2504b with rogero cfw 4.55 and didnt have fan control on that cfw. Temps were usually up to 68-70 on cpu and up to 65C on gpu. Now I bought also PS3 slim but 2504a. This should be same factory process as 2504b, right? But on this new 2504a gpu is always hotter than cpu, for example cpu is on 66C and gpu 70C after half hour gaming. Is that normal?
Also I started to monitor temps and fan speed with webman and I see that PS3 starts with fan speed 20% and slowly increase only...

PS3 slim fan speed