New graphics card, need help with possible compatibility

So, I have a Hp Pavillion p7-1007c desktop computer and i wanted to know if a GeForce 8400 would be compatible with the spacing and my motherboard. Don't know much about computers/GPU's, so if you could reccomend a better one for about <$60 it would be much appreciated. Motherboard - N-Alvorix-RS880-uATX (Alvorix). Sorry this is my first post on here. I would enjoy any help I could receive on the matter. Oh and power supply is Internal 250W (100-240V)

 

Assuming it's for gaming, it basically isn't worth it to buy any graphics card that costs less than $100. The price/performance is utterly awful.

kind of on a budget here. dont have a lot of money to throw at this

Well if you're willing to deal with a mail in rebate this is a pretty decent deal on a 250x: 

I still think you'd be better off just saving up some more money and buying a $100 HD 7770 and a new power supply. http://www.newegg.com/Product/Product.aspx?Item=N82E16814131559&cm_re=PowerColor_AXR7_250X_1GBD5-HE_Radeon_R7_250X_1GB_128-Bit_GDDR5_PCI_Express_3.0_HDCP_Ready_CrossFireX_Support_Video_Card-_-14-131-559-_-Product

do you know if that would fit/be compatible with my computer?

Spacing? As in PCI-e lanes? Or room inside the case? A GeForce 8400 like this one should fit in your case since they all only take up 1 PCI-e lane, and only 2/3rds the height of the PCI-e I/O. It doesn't even require a power supply to run.

is that the best one in your opinion for my price range? or is there a better one you had im mind? thanks for the info though helps a bunch

You could get the radeon 250 on amazon for sale down to $65  and from what I've seen from benchmarks it seems much better than the 8400. But another thing when looking for a new graphics card is your power supply, do you know how many watts yours is?

Yeah that sounds a lot better. i had been looking at the wrong one. power supply is 250w

EDIT/UPDATE: Thinking of new card: XFX R7 250. Anyone know if that would fit in the case or if i would have to look and see? Case dimensions are:  Height: 38.81 cm (15.28 inches) Width: 17.50 cm (6.89 inches) Length: 40.99 cm (16.14 inches). Also would like to know if the plugs/slots are compatible.

This one will fit guaranteed, has brackets for half height pci slots and full height pci slots

http://www.newegg.com/Product/Product.aspx?Item=N82E16814129294

 

Do you have the dimensions for that one? Cause i was looking at this one http://www.amazon.com/XFX-Profile-Boost-Graphics-R7250AZLF4/dp/B00FS6ABEG/ref=sr_1_2?ie=UTF8&qid=1406239428&sr=8-2&keywords=xfx+radeon+250