overclocking recommendedations n helps

Romeo_sami

Honorable
Apr 23, 2013
17
0
10,510
as per my needs, I've got ASUS AMD HD RADEON 5450 1GB GDDR3.
Its default configuration was 650Mhz.n 450Mhz for gpu n memory clock respectively. I overclocked them to 840Mhz. n 820Mhz, is this too much for a low end n more often HTPC card? well arkham series at fine settings r working like a charm without glithes. fine fps. Max gpu temperature on 100% load is 67-70C. normally 55C. at idle 45C.
plz someone speak to me.
 

Romeo_sami

Honorable
Apr 23, 2013
17
0
10,510
max voltage 1.100. min 0.900
avg 0.966
so how much heat can it accomodate with my small 3 X90mm fans (1140 rpm) (1-intake 2-exhaust).
shall i install an AC/cooler in my room?
is seems stable at medium.settings, even prototype 2, darksiders 2, arkham asylum run superbly.
nfs the.run (limited.edition) at fine setting seems.a bit laggy