Just two days away from the Radeon HD 5830’s anticipated and delayed
release, IT168 has leaked the vital details presentation slides.

As the name suggests, the HD 5830 is based on the same Cypress GPU that
powers the HD 5850 and HD 5870. What the name does not suggest, though,
is that at the heart of the HD 5830 that is so crippled it hardly
resembles a Cypress. Only 14 of the Cypress’ 20 SIMDs make it to HD 5830
– with a total of 1120 SP and 56 TMU.

More details next page.

Just two days away from the Radeon HD 5830’s anticipated and delayed
release, IT168 has leaked the vital details presentation slides.

As the name suggests, the HD 5830 is based on the same Cypress GPU that
powers the HD 5850 and HD 5870. What the name does not suggest, though,
is that at the heart of the HD 5830 that is so crippled it hardly
resembles a Cypress. Only 14 of the Cypress’ 20 SIMDs make it to HD 5830
– with a total of 1120 SP and 56 TMU.

ROPs have been chopped in half, to leave behind only 16 out of the 32 on the HD 5850 and the HD 5870. However, to compensate, ATI have moved the clock speed all the way up to 800 MHz, a full 75 MHz more than the 1440 SP HD 5850 and only 50 MHz down on the flagship HD 5870.

The memory stays at 1 GHz G5, with the memory bandwidth at 128 GB/s, same as the HD 5850. The final number that pops out is the TDP – which is inexplicably more than the HD 5850 – at 175W. The idle usage is a tad lower at 25W, however.

It is likely that the HD 5830 GPUs are harvested from the very worst of Cypress – likely from the early part of production with all the 40nm “chamber mismatch” issues. A full 14 of 20 SIMDs disabled likely signifies a troublesome fabrication process. The other reason may be that ATI wanted to distinguish the HD 5830 from the HD 5850 significantly.

The MSRP is expected to be in the $199 to $249 range, likely to be $239. Final performance numbers remains to be seen, as we are not far away from the official release. The success of HD 5830 will depend largely on how much of a bottleneck cutting ROPs by half causes.

Interestingly, as it turns out, the mystery 1120 SP rumoured from way back in early October 2009 is indeed the HD 5830, after all.

Also leaked are pictures of some fancy non-reference designs by AIB vendors.

Reference: IT168