Worrying temperature?

[MacBookDan]

Hey, as some of you know I've just got my MacBook which was off a friends friend which has been refurbished (new screen). The MacBook specs are below.

I was wondering what the normal temperatures are for this type of MacBook.

I'm currently @ 44c, sometimes idle it's 35-50 which is fine for me... when loading a game or even YouTube videos the temp can go up to 85-90c, which I worry about.

Is this normal for the temps to be so hot? The RPM goes up to 6k RPM+

Specs:
Model Name: MacBook
Model Identifier: MacBook3,1
Processor Name: Intel Core 2 Duo
Processor Speed: 2 GHz
Number Of Processors: 1
Total Number Of Cores: 2
L2 Cache: 4 MB
Memory: 2 GB
Bus Speed: 800 MHz
Boot ROM Version: MB31.008E.B02
SMC Version (system): 1.24f2
Serial Number (system): xxxxxxxxx
Hardware UUID: xxxxxxxxxxxxxxxx
Sudden Motion Sensor:
State: Enabled

Chipset Model: GMA X3100
Type: GPU
Bus: Built-In
VRAM (Total): 144 MB
Vendor: Intel (0x8086)
Device ID: 0x2a02
Revision ID: 0x0003
Displays:
Color LCD:
Resolution: 1280 x 800
Pixel Depth: 32-Bit Color (ARGB8888)
Main Display: Yes
Mirror: Off
Online: Yes
Built-In: Yes
Display Connector:
Status: No Display Connected

 

[BlueRevolution]

My 13" Mid 2010 MacBook Pro's processor tops out at about 71ºC while playing Crysis. I wouldn't be too worried about high temperatures, although you should avoid putting it on your lap or anything flammable when it gets that hot. Computers are designed to switch off automatically should they reach damaging temperatures.