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Video random-access memory (VRAM) is dedicated computer memory used to store the pixels and other graphics data as a framebuffer to be rendered on a computer monitor. [1] It often uses a different technology than other computer memory, in order to be read quickly for display on a screen.
The Intel 8080 used by these computers was an 8-bit processor, with 16-bit address space, which allowed it access up to 64 KB of memory; .COM executables used with CP/M have a maximum size of 64 KB due to this, as do those used by DOS operating systems for 16-bit microprocessors.
It is beneficial for the GPU's compute units to have fast access to a physically close cache rather than searching for data in video memory. AMD claims that RDNA 2's 128 MB of on-die Infinity Cache "dramatically reduces latency and power consumption". [ 16 ]
For example, if there was a 50 KB UMB and a 10 KB UMB, and programs needing 8 KB and 45 KB were loaded, the 8 KB might go into the 50 KB UMB, preventing the second from loading. Later versions of DOS allowed the use of a specific load address for a driver or TSR, to fit drivers/TSRs more tightly together.
The 16-way associative L1 cache shared across a shader array is doubled in RDNA 3 to 256 KB. The L2 cache increased from 4 MB on RDNA 2 to 6 MB on RDNA 3. The L3 Infinity Cache has been lowered in capacity from 128 MB to 96 MB and latency has increased as it is physically present on the MCDs rather than being closer to the WGPs within the GCD ...
A memory upgrade for the U50 is rumored to exist in Japan at an extremely high price. As of approximately January 2005, Sony Japan had discontinued the U70p, and introduced a new model, VGN-U71P. The upgraded features include a 1.1 GHz CPU with 2 MB of cache, and a 30 GB hard drive.
Hynix Semiconductor introduced the industry's first 60 nm class "1 Gb" (1024 3 bit) GDDR5 memory in 2007. [3] It supported a bandwidth of 20 GB/s on a 32-bit bus, which enables memory configurations of 1 GB at 160 GB/s with only 8 circuits on a 256-bit bus. The following year, in 2008, Hynix bested this technology with its 50 nm class "1 Gb ...
A system with 512 MB of RAM (the minimum requirement for Windows Vista) can see significant gains from ReadyBoost. [14] [15] In one test case, adding 1 GB of ReadyBoost memory sped up an operation from 11.7 seconds to 2 seconds. However, increasing the physical memory (RAM) from 512 MB to 1 GB (without ReadyBoost) reduced it to 0.8 seconds. [16]