Hi. My Xbox is quite hot. After an hour of game CPU has about 55C, and MB about 45C.
Console is hard modded (dual-bios, component video output, LG dvd, larger HDD, 80mm fan). I've also changed the thermal grease to Arctic Cooling MX2.

Any suggestions?
I think about changing the heatsinks, but I found only 1 which will be suitable (80mm) and it is quite small...
https://elektronika-sklep.pl/sklep/index.ph...v797-silentline

In my country it is impossible to buy Iceberg.

That sounds like normal temps. I don't think you could expect better with out some extensive changes - and I wouldn't worry about it unless your CPU is going over 70°C

Maybe... I was writing according to this http://www.xboxscene.com/articles/thermal-compound.php
He has much cooler Xbox.
I think I will leave it...

What I did:
1 - Take out both heatsinks, clean them, lap them and apply arctic cooling 5 thermal paste. Granted, I have a 1.6 xbox, so no fan on the heatsink.
2 - Swapped the 60mm fan by a Noctua 80mm fan, cutting out the fan corners to make it fit, and the xbox metal grid to maximize airflow.
3 - Since I swapped the HDD for a 7200RPM 120GB, I also cut out the back of the HDD tray so my 80mm fan sucks air from the tray, cooling the HDD.

So not much more than you did, and like you, I have temps at 55/45, which I too think is fine.