Monday, November 04, 2013

Broadwell against Kaveri

 A lot of optional geometry shaders in Broadwell.
- Right now there are GT1, GT2, and GT3 variants shown for the initial Broadwell processors. The Broadwell GT1 PCI IDs include 0x1602, 0x1606, 0x160A, 0x160B, 0x160D, and 0x160E. Broadwell GT2 PCI IDs are 0x1612, 0x1616, 0x161A, 0x161B, 0x161D, and 0x161E. Lastly, the high-end GT3 graphics for Broadwell are IDed as 0x1622, 0x1626, 0x162A, 0x162B, 0x162D, and 0x162E.

- Over Ivy Bridge / Haswell "Gen7" graphics, Broadwell "Gen8" claims support for a maximum of 280 VS threads over 36 on Gen7 hardware, a maximum of 256 GS threads over 36 on Gen7, and 64 WM threads over 48. The URB size has also quadrupled to 512 and the max VS entries supported are now 1664 over 512 and 640 GS entries over 192 on Gen7 hardware.

Coming back to the details, it has been claimed that Intel Broadwell would pump up the  GPU performance of by 40% over Haswell which itself has a powerful GPU side. Intel Broadwell GPU would also bring in new and improved instruction set.

There are three variants of Haswell graphics, GT1, GT2, and GT3. The top end part, GT3, has 40 of the enhanced Ivy shaders. If the chip does not increase GPU clocks at all, has zero performance enhancements, nor anything else, it will be 2.5x as fast as Ivy Bridge. That in turn is 2x as fast as Sandy Bridge, so 5x what you can buy from Intel today. AMD’s Kaveri had better be damn quick to stay in the game. Berlin too ?

99% BAD HARDWARE WEEK: But, after latest delay Broadwell is at least 6 months behind Kaveri.

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