That is a workstation card. You don't want that. That's for business use and wouldn't be great for gaming.
Second, the stock PSU is only 250W for that computer, that would need an upgrade. Third, there is no point getting a $150 graphics card when your CPU is only a Pentium.
You will quite honestly need to save up for a decent computer if you want to upgrade.
Also, posting this in it's own topic won't get it any better attention. Please try to use the megathread for this kind of question, this is exactly what we help with.