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How much Vid mem

  • Graphics Cards
  • Graphics
Last response: in Graphics & Displays
February 22, 2009 11:38:22 PM

I am currently facing the dilemma that I need a new video card. My 7900 GT is becoming painfully old and is most likely soon to be transferred to my neices machine in favor of a new card. I'm probably going for a Radeon 4870. Seems like the logical choice ATM. Not sure if I should get the 1gb or the 512mb at this point. Here is my setup.

AMD athlon 64x2 6000+ (heats my room better than the furnace)
Asus M3a78-em Mobo (It was cheap)
OCZ gold 2x2gb ddr2-1066
19in Optiquest Q19wb monitor with 1440X900 max res.
Black Steel 580W psu
Shuttle mATX case (cube style... totally inefficient for cooling but my wife thinks its... cute...)

Given the max res on my monitor at 1440x900 and the PSU is only 580W (25a at 12v rails) I'm thinking that the 512mb would be fine. BUT, In the next room (about 14ft from my PC case, is a DLP projector that I wouldn't mind hooking this thing to when I can afford some long DVI/Audio cables. At that point, I would need a 1gb card seeing as the screen size on the projector shoots about 105" at 1280x720... Anyone got any good thoughts that don't involve changing the mobo? :) 

More about : vid mem

February 23, 2009 12:07:10 AM

Not necessary to change mobo.. get a 1GB version of HD4870... that would be enough..
February 23, 2009 12:15:25 AM

720p is still a fairly low resolution. i would say that 512MB is enough, unless the price difference is small.
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February 23, 2009 12:17:00 AM

The 512 won't have any problem with the resolutions you're using.
February 23, 2009 12:45:41 AM


Those benches make it pretty much a no brainer. Hopefully I'll be able to find a good RF kbd/mouse combo so I can game on the projector in the other room. lol :)  Otherwise the Projector will be HTPC use only! Thanks for the swift end to my debate guys!

February 23, 2009 12:57:26 AM

512 is fine !! ill only recommand 1gb if you plan on playing GTA4 ... needs alot of video mem to play on HIGH settings.

Have fun !
February 23, 2009 12:59:33 AM

This is from a recent post of mine
Also I wouldn't recommend the 1 gig version something tells me with DDR4 memory isn't going to be any faster regardless of 512mb vs 1gig due to limitation of the 256bit bus ( basically from what I have read it will not be able to address the memory quick enough kinda the same logic behind why 128bit cards with 512mb where worthless and just for show).

One thing I think a lot of people over look is the fact that the HD4870 runs DDR4 memory which is a lot faster then the DDR 3 most cards run (LOT FASTER) so it bottle necks because the memory is being address so fast and the data can only flow from the card to the board so quick ( in this case 256bits)

If I am not wrong this is why most the new Nvidia cards run a a 448bit bus or 512bit bus is because they have more then 512mb of memory in fact I believe that running more then 512mbs of DDR3 memory on a 256bit bus has the same limitation.