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Some Bulldozer Napkin Math Speculation...  

post #1 of 6
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Hi all,

As a VFX artist for feature film, I do an absolute **** load of 3D rendering...non-stop, 24 hours a day, 7 days a week basically. As such, I am constantly looking for where the best bang for the buck lies in terms of computing power...truly, I can say that no amount of CPU speed would ever be wasted on me or bottleneck any time at all. I'm lucky and cursed in that regard; I benefit 100% of the potential for any and all computer advancements and I also get to pay for it.

That having been said, I am taking a VERY keen interest in AMD's future offering. Until it's released and we have real benchmarks to go by, here is some quick and dirty math on what I personally think we might expect in terms of rendering performance.

Right now, a Phenom II X6 1090T @ 4.2ghz can push a CineBench 11.5 score of 7.2. Same chip at 3.7ghz is listed with 6.6.

This puts the per core score of that architecture at around 1.16 @ 4ghz.

With Bulldozer, I get another 2 cores. If Bulldozer turns out to be NOTHING BUT a Phenom x6 with 2 more cores, and only capable of 4.2ghz speeds...we could expect a CB score of ~9.6 which is ALREADY similar to an i7 2600k @ 5ghz (which is what I'm currently using in my render nodes because the price/performance can't be touched by anything).

However, from much of the leaked info from AMD thusfar, we can assume it will be quite a bit better than that. Their Interlagos graph seems to show the architecture change is worth a 108% increase in floating point speeds and a 52% increase in integer speeds per core (if you do some math because the new chips are 16 cores and being compared to 12 cores).

I've also seen a test on Tom's hardware of an Interlagos engineering sample where a 32 core AMD machine @ 1.8ghz performs in 25 seconds what the i5 2500k can do in 61 seconds. If you math that out, an 8 core Bulldozer chip @ 3.6ghz would come in at 50 seconds; 22% faster than the Sandy Bridge chip. I'd hope that an engineering sample would be pretty crap too.

Almost guaranteed, the 32nm process should allow for higher overclocks than are possible on Thuban.

In addition to that, let's say they've increased their per-core performance by 20% over Thuban.

Assuming a BD chip will happily overclock to 4.5ghz, that would put an 8 core Bulldozer into CineBench territory of 12.5.

If the chips can hit 5ghz, we might be looking at scores of 13.9.

If the IPC gains are higher than 20%...you get the idea. 30% would be a score of 15. 40% would be 16.2.

TL;DR Version:

I have a REALLY good feeling that Bulldozer is going to be completely bad ass.
Edited by kweechy - 8/7/11 at 11:43pm
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post #2 of 6
Bulldozer thread number #13092804. Commence the flame war. It's pretty much the same thing to just close the thread right now to avoid an unnecessary flame war and such.
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post #3 of 6
the difference is I liked the use of the expression "napkin math"
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post #4 of 6
Like the 'napkin math' expression. Anyways, you won't be able to tell the performance since what's been released now may not be its true capability. Basically, wait until it's released and is benchmarked. Then we will see how it truly performs.
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post #5 of 6
Quote:
Originally Posted by HybridCore View Post
Like the 'napkin math' expression. Anyways, you won't be able to tell the performance since what's been released now may not be its true capability. Basically, wait until it's released and is benchmarked. Then we will see how it truly performs.
All I'm curious about is whether the Bulldozer chips will have the same IMC performance as Sandy Bridge's IMC. The memory performance right no on AMD chips is poor poor poor!
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post #6 of 6
Quote:
Originally Posted by Note from OCN staff
Due to the increase in Bulldozer related threads, and the lack of any hard evidence regarding the performance of said CPU's thus far, please keep all Bulldozer related comments here in this thread. If there are any Bulldozer threads made outside of this thread, they will be removed. If you happen to see one, please hit the report button.

Thank you.
~pio
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