Friday, September 24th 2010

AMD Orochi ''Bulldozer'' Die Holds 16 MB Cache

Documents related to the "Orochi" 8-core processor by AMD based on its next-generation Bulldozer architecture reveal its cache hierarchy that comes as a bit of a surprise. Earlier this month, at a GlobalFoundries hosted conference, AMD displayed the first die-shot of the Orochi die, which legibly showed key features including the four Bulldozer modules which hold two cores each, and large L2 caches. In coarse visual inspection, the L2 cache of each module seems to cover 35% of its area. L3 cache is located along the center of the die. The documents seen by X-bit Labs reveal that each Bulldozer module has its own 2 MB L2 cache shared between two cores, and an L3 cache shared between all four modules (8 cores) of 8 MB.

This takes the total cache count of Orochi all the way up to 16 MB. This hierarchy suggests that AMD wants to give individual cores access to a large amount of faster cache (that's a whopping 2048 KB compared to 512 KB per core on Phenom, and 256 KB per core on Core i7), which facilitates faster inter-core, intra-module communication. Inter-module communication is enhanced by the 8 MB L3 cache. Compared to the current "Istanbul" six-core K10-based die, that's a 77% increase in cache amount for a 33% core count increase, 300% increase in L2 cache per core. Orochi is built on a 32 nm GlobalFoundries process, it is sure to have a very high transistor count.Source: Xbit Labs
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152 Comments on AMD Orochi ''Bulldozer'' Die Holds 16 MB Cache

#1
WarEagleAU
Bird of Prey
sounds like some good news happening. I cant wait to see some reviews. Im not really hyped if it destroys anything intel has I am just hoping it puts it on more of an even par.
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#2
bear jesus
WarEagleAU said:
sounds like some good news happening. I cant wait to see some reviews. Im not really hyped if it destroys anything intel has I am just hoping it puts it on more of an even par.
All i ever hope from amd is acceptable performance at a good price as for me the gpu is most importaint even more so as i try to avoid dual cards, although i am really looking forward to how the server parts perform and hope they do really well against intel.
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