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768 Mb not 1 GB ???

  • 23-06-2007 3:31pm
    #1
    barry181091
    Registered Users, Registered Users 2 Posts: 1,628 ✭✭✭


    Hey Guys,
    All of the high end 8800 models are 768 Mb (IE GFX & Ultra) , Well I was wondering why not 1 GB ?? It seems a little strange that they just stop at 768 Mb ?


    Barry.


Comments

  • #2
    jhegarty
    Registered Users, Registered Users 2 Posts: 6,441 ✭✭✭jhegarty


    barry181091 wrote:
    Hey Guys,
    All of the high end 8800 models are 768 Mb (IE GFX & Ultra) , Well I was wondering why not 1 GB ?? It seems a little strange that they just stop at 768 Mb ?


    Barry.


    Cost I presume. The type of memory used in graphics cards is failry pricey, and I would image it would give a marginal benefit at best.


  • #3
    8T8
    Closed Accounts Posts: 4,757 ✭✭✭8T8


    GeForce 8800GTX uses a 384-bit memory bus (64x6 -12 RAM chips on each card) so the amount of RAM works out differently hence the 768MB amount. The 8800GTS uses a 320-bit memory bus so thats why it has 320/640MB amounts.

    Radeon HD 29xx series uses 512-bit memory bus hence the 512MB/1GB options.

    Going over the 1GB limit for NVIDIA might mean a new card required with a different memory bus layout or going over the 1GB which would make it a very expensive card for little benefit. Only at extreme resolutions with lots of AA/AF does that amount of RAM on the card actually becomes useful.


  • #4
    barry181091
    Registered Users, Registered Users 2 Posts: 1,628 ✭✭✭barry181091


    Hey thanks 8T8 , Very helpful :)

    Barry.


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