View Single Post
  #90  
Old 07-05-2011, 09:50 AM
inf64 inf64 is offline
640k who needs more?
 
Join Date: Mar 2010
Posts: 995
inf64 is on a distinguished road
Default

Quote:
Originally Posted by Guild View Post
Food for thought - they are actually benching a SB Quad-core (4T) versus an IB dual-core (4T).

Once again, an IB dual-core is almost as fast as a SB quad-core albeit without HT (which boosts performance by a max of 30%).

Different conclusion?
Sorry but no,you don' know what you are talking about.Since I'm bored,I will demonstrate it for you.

HW used :
IB ES 2C/4T @ 1.8Ghz,4MBL3
SB @ 1.8Ghz, 4C/4T,6MB L3

Tests:

CPU mark99-purely single threaded integer benchmark,cores don't matter.
IB @ 1.8Ghz gets 278pts
SB @ 1.8Ghz gets 276pts
Practically the same results,tiny difference that fits in margin of error.

SPi 1M-purely single threaded benchmark,with mixed int and fp code.
IB @ 1.8Ghz gets 22.19s
SB @ 1.8Ghz gets 20.8s
SB at the same clock is 6.6% faster than IB ES.

Cine 11.5- single and multithreaded benchmark,uses a lot of fp SSE instructions. In this particular case,tester used MT benchmark.In order to figure out how SB which has 2C/4T performs in it,we can find a comparable i3 SB retail chip and its score in C11.5 and then scale it down to 1.8Ghz clock.

IB @ 1.8Ghz 2C/4T gets 1.81pts
SB @ 1.8Ghz 4C/4T gets 2.61pts
SB 2120 model which is 2C/4T @ 3.3Ghz and no Turbo gets 3.19pts.
Compensate for 1.8Ghz clock speed : 3.19x1.8/3.3=1.74pts
So to recap:
IB @ 1.8Ghz 2C/4T gets 1.81pts
SB @ 1.8Ghz 2C/4T gets 1.74pts
SB at the same clock is 4% slower than IB ES.

Summary:
IB ES is roughly on par with SB at the same clock and with the same number of cores and threads.There are some minor differences so actual scores vary from it being 6% slower than SB(SPI) ,being practically equal to it(CPU mark99) to being 4% faster(C11.5) at the same clock/core/thread configuration.All this is based on early ES,so clock speeds will move up and probably Turbo will be a bit more aggressive with IB.This could lead to better overall scores,but knowing intel's ES from the past,they usually perform within 5% from retail parts(at the same clock).This practically leaves only clockspeed/Turbo as a variable.
__________________
Latest blog

Last edited by inf64; 07-05-2011 at 09:53 AM.
Reply With Quote