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Realistically, what performance can we expect from bulldozer? - Page 3

post #21 of 28
Quote:
Originally Posted by BallaTheFeared View Post
Power gating is probably only meant for stock, I can't see BD clocking to 4.6GHz on all cores, then power gating to 5Ghz, unless 5Ghz was achievable in the first place.

I just want to see the single thread per clock performance vs sandy, then compare max overclocks.

Everything else (including power gating) is for non overclockers.
People have different heatsinks and case cooling capability as well as ideas for how far they want to increase the vcore.

Even for "overclockers", I can imagine many a situation where you can't cool all cores at 5GHz+ (@1.48v for example), but you are fine if you set all cores at 4.6GHz (1.4v) then, thanks to power gating, boost to 5.2GHz (for example) at the same voltage. The only required option in the BIOS is the ability to increase the "TDP" TurboCORE is using for a reference. Also even if you have a great cooling setup, there may be overclockers that want to get near 5GHz for games, but don't want to run at the vcore required to have all 8 or 6 cores stable at those clocks 24/7.

Just because TurboCORE is useless to overclocker in it current form does not mean we should assume that it will be useless on Bulldozer.
post #22 of 28
I missed something here, what is Power Gating?
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post #23 of 28
Here's an explanation of the "3D transistor" Intel is implementing, it talks about power gating and kind of touches base on the subject but they're moreso demonstrating their 3D transistor rather than talking exclusively about power gating.

http://www.youtube.com/watch?v=YIkMaQJSyP8#t=2m12s
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post #24 of 28
Quote:
Originally Posted by JCPUser View Post
Just because TurboCORE is useless to overclocker in it current form does not mean we should assume that it will be useless on Bulldozer.
Wrong, it can be extremely useful when you have a 1055T.
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post #25 of 28
I'd guess a Bulldozer at 3GHz is the same as a i7 Sandy Bridge at 2.67GHz.
If so, then it is the typical AMD/Intel speed we've seen since Conroe
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post #26 of 28
Quote:
Originally Posted by ronnin426850 View Post
I missed something here, what is Power Gating?
"Power gating" is the ability to turn off parts of the cpu to save power. We know that at least TurboCORE2.0 will use it to turn off unused cores with the goal of providing a clock speed boost to active cores.

For example, if you are playing at game that uses cores 0 and 1 -- then in theory cores 2-7 would be "gated" (allowing no current to reach them) and the active cores 0 and 1's clock speed would be boosted up untill the rated TDP of the processor. Furthermore, even if no cores are being gated (i.e all cores in use) TC2.0 will boost up to TDP. Also, note that power gating may be used in other features outside of TC2.0. Finally, as I understanding it -- the amount of power saved by gating is much larger than simple downclocking meaning that TC2.0 won't need to up the voltage when active. Thus it should work at whatever voltage that is set in the BIOS whether it is stock or user defined.

Of course, it will be useless to OCers if we can't increase the rated TDP of the processor that is used for a reference in the BIOS -- so it remains to be seen if it will boost performance on OCed CPUs. Plus, AMD may have not designed TC2.0 to work at voltages other than stock. All the details are not known as of yet. However, even if TC2.0 doesn't help/can't be used when you are OCing, "power gating" should yield lower CPU temps which in turn means better clocks.


tl;dr "Power Gating" disables unused parts of the CPU to save power. That power can be used for active areas of the processor. It remains to be seen if this will be useful while overclocking.

EDIT: @Devilmaypoop
Sure it may be useful, but as I understand it TC will not function properly if the voltage is not stock. Please correct me if I am wrong. Thus most people (myself included) have chosen to disable it in order to get the same or better OC by increasing the voltage and overclocking in the usual fashion. Now if the new TC2.0 will function with a user defined voltage and thus boost on top of a OC then we really have something useful.
Edited by JCPUser - 5/9/11 at 5:27am
post #27 of 28
Quote:
Originally Posted by JCPUser View Post
People have different heatsinks and case cooling capability as well as ideas for how far they want to increase the vcore.

Even for "overclockers", I can imagine many a situation where you can't cool all cores at 5GHz+ (@1.48v for example), but you are fine if you set all cores at 4.6GHz (1.4v) then, thanks to power gating, boost to 5.2GHz (for example) at the same voltage. The only required option in the BIOS is the ability to increase the "TDP" TurboCORE is using for a reference. Also even if you have a great cooling setup, there may be overclockers that want to get near 5GHz for games, but don't want to run at the vcore required to have all 8 or 6 cores stable at those clocks 24/7.

Just because TurboCORE is useless to overclocker in it current form does not mean we should assume that it will be useless on Bulldozer.

I guess, worthless to me though since temps are never my limiting factor.

As I said though they've released "some" information as we've seen on the server based chips which should perform nearly the same as the desktop chips expect more cores and lower clocks.

They haven't given any information on where their numbers came from, at what core speed was that performance increase measured at. Was it measured based on full load throughput, or mix bag loads with increased frequencies via power gating.

We'll know soon enough, the cool thing about technology is that no matter what tomorrow brings, next week is bringing something smaller and faster.
    
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post #28 of 28
Quote:
Originally Posted by BallaTheFeared View Post

We'll know soon enough, the cool thing about technology is that no matter what tomorrow brings, next week is bringing something smaller and faster.
Nice generic stuff
   
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