Upgrading my Graphics card

[The Real Beandip]

I use a stock HP P7-1414 and am looking to buy a new graphics card. I found two cards that seem OK. One has high RAM while the other has more cuda cores.
(names are as shown on newegg)
RAM: SPARKLE 700005 GeForce GT 630 4GB 128-bit DDR3 PCI Express 2.0 x16 HDCP Ready Video Card

Cuda Cores: MSI N640-1GD5/LP GeForce GT 640 1GB 64-bit GDDR5 PCI Express 2.0 x16 HDCP Ready Video Card

Will these cards work with my PC? If the both work which one will work better for gaming?

COMPUTER INFO AND BUDGET:

Budget: $170 (I will not buy any other parts other than a graphics card that will perform better than my current integrated one or better than the 2 earlier mentioned cards. If you cant find a better card please tell me which of the cards I mentioned is better for gaming.)

PC model: HP P7-1414

Motherboard: MSI MS-7778 (Jasmine)
Manufacturer: MSI
Form factor: uATX - 24.4 cm (9.6 inches) x 24.4 cm (9.6 inches)
Chipset: AMD A75 FCH
Memory sockets: 2 x DDR3
Front side bus speeds: UMI 5 GT/s
Processor socket: FM2
Expansion Slots:
1 PCI Express x16 (Gen 2.0)
3 PCI Express x1 (Gen 2.0)
1 PCI Express Mini Card (Gen 2.0)

Processor: AMD A8-5500
TDP: 65W
Operating speed: 3.2 GHz (up to 3.7 GHz turbo)
Number of cores: 4
Socket: FM2

Memory (RAM): 6 GB
Amount: 6 GB
Speed: PC3-12800 MB/sec
Type: DDR3-1600

Video Graphics: Integrated AMD Radeon HD7560D

Computer Case: ATX
Height: 39.4 cm (15.55 inches)
Width: 17.5 cm (6.89 inches)
Depth: 40.9 cm (16.14 inches)
Weight: 10.9 Kg (24.03 lbs) - without packaging

Power Supply: Internal 300W (100V-240V)
Form factor: Internal ATX
Total wattage: 300W
Nominal input voltage range: 200-240V/3A (50-60Hz)
Dimensions: 150mm x 140mm x 86mm (5.9 x 5.5 x 3.4 inches)

[FangedBeast]

What is your screen resolution?

From a quick glance, that 4GB seems overkill - I'd choose the 640

[Jew]

I dont know what you computer is like...but for 170$ there is no better deal then this
Amazon.com: Sapphire Radeon HD 7870 GHZ OC 2 GB 256 -bit GDDR5 DL-DVI-I/SL-DVI-D/HDMI/DP PCI-Express Graphics Card 100354OC-2L: Computers & Accessories
This card kicks ass
Thank me if i helped you

[The Real Beandip]

think the 4GB one would work better for gaming though? Not too worried about overkill. And i currently use a 1600x900 resolution an an hp 2009m monitor. thinking about buying an ASUS VK248H-CSM monitor. The 4gb is also cheaper.

[The Real Beandip]

Cant use that card because of my 300 watt power supply.

[Jew]

Cant use that card because of my 300 watt power supply.

Get a bigger one

[The Real Beandip]

I cant really afford to be spending over 170 dollars at the moment.

[The Real Beandip]

If it were just those 2 cards that I mentioned which would perform better in games at higher settings?

[Aborted]

If it were just those 2 cards that I mentioned which would perform better in games at higher settings?

​I'd need to know your price range, as those 2 cards aren't particularly the best for their budget.

[The Real Beandip]

editing the original post. check there for all info.

[The Real Beandip]

added all that info to original post.