The PS3 Memory: * 256MB XDR Main RAM @3.2GHz * 256MB GDDR3 VRAM @700MHz
The Xbox 360 Memory : 512 MB of 700 MHz GDDR3 RAM
The xdr is way faster than the ram used in the 360... and http://www.rambus.com/us/products/xdr_xdr2/ you will see that its
"Rambus XDR™ DRAM technology is a total memory system solution that achieves an order of magnitude higher performance than today's standard memories while utilizing the fewest ICs. Perfect for graphics processing, consumer electronics, network, and server applications,"
"Graphics Double Data Rate 3, is a graphics card-specific memory technology, designed by ATI Technologies.
It has much the same technological base as DDR2, but the power and heat dispersal requirements have been reduced somewhat, allowing for higher-speed memory modules, and simplified cooling systems. Unlike the DDR2 used on graphics cards, GDDR3 is unrelated to the upcoming JEDEC DDR3 specification. This memory uses internal terminators, enabling it to better handle certain graphics demands. To improve bandwidth, GDDR3 memory transfers 4 bits of data per pin in 2 clock cycles."
"VRAM is a special type of DRAM which is dual-ported. It still has a duty cycle, but it can written to and read from at the same time. In practice, this means that you get double the bandwidth out of 60 ns VRAM as you would out of 60 ns DRAM (if implemented correctly on the video card).
The long and the short of this is that VRAM cards are capable of higher screen refresh rates at high pixel addressabilities and colour depths, while DRAM cards are not."
http://www.monitorworld.com/faq_pages/q20_page.html
So although the 360 has 512 megs of GDDR3, it can't compete with the 256 xdr, nor does it have VRAM. Its funny when this is used as a arguing point.
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