Collected set of new Ivy Bridge ULP information. 17W Sandy Bridge CPUs are used in the Samsung Series 7 Slate Windows tablets and in Macbook Air and all the other Ultraportables, so it's Ivy Bridge ULP replacement is a very interesting product.
Both are top of the line 17W i7 products (CPU price is around 300$).
Sandy Bridge (Core i7-2677M, 17W)
CPU: 2/4 threads, 1.80 GHz base, 2.90 GHz turbo
GPU: HD 3000 (12 EU), 350 MHz base, 1200 MHz turbo
Ivy Bridge (Core i7-3667U, 17W)
CPU: 2/4 threads, 2.00 GHz base, 3.20 GHz turbo
GPU: HD 4000 (16 EU **), 350 MHz base, 1150 MHz turbo
**) A single HD 4000 EU can do two MADs per clock and has two texture samplers, theoretically doubling the performance of HD 3000 EU:
http://www.anandtech.com/show/4830/intels-ivy-bridge-architecture-exposed/5
Some raw math and conclusions:
- 11% higher CPU base frequency, 10% higher CPU turbo frequency.
- CPU has some architectural improvements over Sandy Bridge (such as float16 conversions and HW random generator), but it's not a completely new core, so we shouldn't expect huge IPC gains (a few percents maybe).
- GPU base frequency is the same, turbo frequency is 4% lower.
- HD 4000 has 16 EUs while HD 3000 has 12 EUs. That's a 25% improvement in execution unit counts.
- HD 4000 is a completely new GPU architecture, and has twice the MAD throughput and texture samplers per EU and several other improvements. How much real life performance these improvements give is unknown at the moment.
- Theoretically you could calculate 0.96 * 1.25 * 2.0 = 2.4. So a bit over 2x performance over the old HD 3000 should be possible in some scenarios (synthetic benchmarks) at least.
Some new benchmarks (Sandy and Ivy with same clock compared):
http://www.xbitlabs.com/news/cpu/di...y_Bridge_Performance_Numbers_to_Partners.html
- CPU performance per clock seems to be improved by around 14%. If gains are similar for the ULP product, in total the 17W Ivy Bridge CPU would be around 26% faster than the 17W Sandy.
- Intel is comparing HD 4000 against the low end HD 2000 instead of HD 3000 it's going to replace (HD 2500 in Ivy will replace HD 2000 in Sandy). GPU performance jump from HD 2000 -> HD 4000 is around 2.5x to 3.0x. But HD 2000 has only half the EUs of HD 3000, so it's very hard to draw any conclusions yet (except that it's going to be somewhere in +25% to +100% range). Intel's estimate of +60% GPU performance sounds pretty much valid (but only for GPU limited software/games).