Which Athlon 64 X2 3800+ is in Inspiron 531s

Solution
Remind me not to get an AMD Athlon series processor - they have too many variants that use the same model number. From what I can find, it looks like the 531s uses socket AM2, but I'm not even entirely sure of that (there are a couple of X2 3800+es that use socket 939). There are three variants of the X2 3800+ that use socket AM2 - one has TDP of 89 W, one is 65 W, and one is 35 W. I can think of some choices for you now:
1. Play it safe and figure you've got the 89 W model.
2. Remove the heatsink and try to read the part number from the cpu (e.g. ADA3800IAA5CU for the 89W model according to Wikipedia)
3. Call Dell and ask them.
Remind me not to get an AMD Athlon series processor - they have too many variants that use the same model number. From what I can find, it looks like the 531s uses socket AM2, but I'm not even entirely sure of that (there are a couple of X2 3800+es that use socket 939). There are three variants of the X2 3800+ that use socket AM2 - one has TDP of 89 W, one is 65 W, and one is 35 W. I can think of some choices for you now:
1. Play it safe and figure you've got the 89 W model.
2. Remove the heatsink and try to read the part number from the cpu (e.g. ADA3800IAA5CU for the 89W model according to Wikipedia)
3. Call Dell and ask them.
 
Solution

Well I know its AM2. I did a bunch on research on the motherboard and it is indeed AM2. And this was a system released in 2007. Don't know if that would make anything more clear.
 

I did exactly that and my combined system with everything only puts out 247w with the 89w. And around 200-230w with the other ones. And around 250 and below is what I was looking for. Thanks for the advice!

 
247w is cutting it awfully close on a power supply rated for 250w, especially a psu from a prebuilt computer, rather than a Tier 1 psu from this list:
http://www.eggxpert.com/forums/thread/323050.aspx
Two other concerns:
1. Have you checked how many amps you need on the +12V rail and how many that psu can give you there? That's more important than total wattage.
2. Psu components slowly wear out over time, so one that's around 6 years old might not be able to deliver the full 250W anymore.
 

+12v=17A
+5v=18A
+3.3v=11A
-12v=.3A
+5VSB=2A
Edit: I went looking around and found the exact processor. ado3800iaa5cu. It is the 65w version. I am all good for now, it's cause of a limited budget otherwise I would upgrade the psu. Thanks for the help though. I actually found the processor code by looking at google images after searching inspiron 531s 3800+ processor.