S3 Graphics AcceleRAM LowFB (Low Frame Buffer) Technology is a combination of hardware and software that enables this new and unique architecture. In this configuration, a part of the larger system main memory (DDR2 DIMMs), called PCIe memory, is used as part of the overall video memory, which includes a small amount of dedicated local video memory.
The consumer benefits, as this unique technology now allows entry level end users the capability of getting all the rich features found in a discrete graphics processor at a low cost while maintaining or surpassing the performance level of competitive solutions in this market segment.
Size and width of the small Local Video Memory can be 64MB/32bit (3.2 GB/s) to 128MB/64bit (6.4 GB/s) @ 400 MHz DDR2. It can also be 64MB/64bit (8.0 GB/s) to 128MB/28 bit (16.0 GB/s) @ 500 MHz DDR3. This is all dependent upon performance requirements.
For systems prior to June 1, 2007, Microsoft Windows Vista will require 512MB of system main memory (DIMMs). Therefore, to get the Premium logo, systems will probably ship with 1.0 GB of system main memory. For systems after June 1, 2007, Windows Vista will require 1.0 GB of system main memory. Therefore, to get the Premium logo, systems will probably ship with 1.5 GB of system main memory. Anything above the memory requirements for Windows Vista, would be used as the Dynamic PCIe System Frame Buffer Memory as well as other system main memory requirements. This large system main memory requirement dramatically increases the overall system cost and necessitates the need for a great low frame buffer technology GPU.
The DDR2 @ 400 MHz (3.2 GB/s) local video memory is for a typical case in the low frame buffer market segment.
The 128bit @ 333 MHz (10.672 GB/s) system main memory is for a typical case in the mainstream market segment.
With the introduction of Microsoft Windows Vista operating system, the system main memory (DIMM) requirement has increased. For systems prior to June 1, 2007, Windows Vista will require, 512MB of system main memory, which means that most, if not all, systems that want to have the Premium logo, will probably ship with 1.0GB of system main memory. After June 1, 2007, Windows Vista will require, 1.0GB of system main memory, which would mean that most, if not all, systems that want to have the Premium logo, will probably ship with 1.5GB of system main memory. This is the current Microsoft Windows Vista requirement. This would dramatically increase the overall system cost and necessitate the need for a GPU with great low-frame buffer technology.