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AMD FX (Bulldozer) Owners Club! - Page 149

post #1481 of 8112
what volts does your FX-4100 need to be stable at 4.6 Karath?
post #1482 of 8112
Its set at 1.45 but the board feeds it about 1.5 under load with the new bios. Before this bios I had to set about 1.57 which then drooped to 1.49 or so.
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post #1483 of 8112
Are voltages like that safe for the chip?
post #1484 of 8112
They dont seem to be harmful, afaik voltage hasnt been the prime killer of cpu's for awhile. (remembering back to sudden northwood death syndrome) Its mainly temps that kill from what Ive experienced recently. Under load I dont see much more than 56c on a chip rated to 71c.
Edited by KarathKasun - 11/21/11 at 4:33am
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post #1485 of 8112
So, you think those volts, as long as the temps are kept down will be safe?? I'm going to be using an Antec Khuyler 620, and I only really want to get 4.5, so I hope my chip will be safe, lol!!
post #1486 of 8112
Quote:
Originally Posted by KarathKasun View Post

core and module names are sales department hogwash in the case of bulldozer.
It has 1 front end (decode etc), 1 FPU, but 2 sets of integer pipes.
Kinda like how Intel supposedly does HT by having extra registers for each core.
Duplicating one part of the chip does not equal dual core. Period.
(AMD just duplicated a more useful and larger silicon structure)
I was on the, "Well, AMD calls it two cores per module... That must be what it is." bandwagon until I owned one of the chips.
Im certain that somewhere in AMD's (ex)marketing department there is a chart that looks like this
Intel Processor hierarchy Thread < Core < Chip
AMD Processor hiearchy Core < Module < Chip
(I see what they did thar)
It seems that the in-house marketing department was nixed for some odd reason.
There are many parallels with P4, like this.
P4 = Empty and meaningless MHZ numbers
BD = Empty and meaningless Core numbers
The thing is, the whole BD fiasco could have been fixed by a change in marketing buzzwords. And the sad thing is, most of the uninitiated computer buyers out there will go for the computer that has more cores at the same price... as long as there is no nerd intervention.
I bought my BD knowing that it underperformed, my main attraction was tweaking / overclocking a new uArch. As well as being able to recommend buying/not buying, from experience, for clients.

do you remember that the fpu wasnt always on the same die on the cpu ...

making your interpretation wrong ...


as a matter of fact the fpu was a co-processor a while ago .. so what would be the part that defines a core???


integer founction ... and even so .. architectural difference wouldn't mean its a 1 1/2 core cpu or something else like many are trying to say ..


its a x8 x6 or x4 but different then what we use or are used to that's all
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post #1487 of 8112
Quote:
Originally Posted by TheFiend View Post

i have a question.....
I use my systems for crunching Docking@Home on BOINC. Has anybody here tried D@H with a Bulldozer and if they have how does it perform?
I am looking at replacing a 955BE with with either a FX8120 or a 1090T/1100T.
My main rig runs a 1055T clocked to 3.5Ghz and has spent most of the last 12 months in the top 20 for RAC in Docking.... thumb:

After doing a bit of research it looks like the Dozer doesn't suite my requirements...... Workunit processing on Docking is about 50% slower. So I've gone with a 1090T...

Looks like I won't be joining the Bulldozer owners club for a while....
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post #1488 of 8112
Quote:
Originally Posted by reflex99 View Post

very constructive talk here guys
well done
applaud.gif

pretty much what you get when there's no fanboyism involved tongue.gif


with the die shrink I'm not really sure what the safe voltages are. with 45nm amd cpu's could handle as high as 1.55v without causing the chip to degrade. dunno with bulldozer but like what the posts above me said. I think you should worry about temps not the voltage. they're related anyway. as long as you good temps voltage does not matter. logic applies with water cooling systems. that's why you're ok to set it as high as you can but temps should be in check
post #1489 of 8112
Quote:
Originally Posted by KarathKasun View Post

Simply because it will have double the decode throughput and logical FPU's
Don't you mean physical?
Quote:
Originally Posted by KarathKasun View Post

core and module names are sales department hogwash in the case of bulldozer.
It has 1 front end (decode etc), 1 FPU, but 2 sets of integer pipes.
Kinda like how Intel supposedly does HT by having extra registers for each core.
Duplicating one part of the chip does not equal dual core. Period.
(AMD just duplicated a more useful and larger silicon structure)
I was on the, "Well, AMD calls it two cores per module... That must be what it is." bandwagon until I owned one of the chips.
Im certain that somewhere in AMD's (ex)marketing department there is a chart that looks like this
Intel Processor hierarchy Thread < Core < Chip
AMD Processor hiearchy Core < Module < Chip
(I see what they did thar)
It seems that the in-house marketing department was nixed for some odd reason.
HT threads share execution resources. Like you said, it only gives extra registers and other bits to maintain thread context. The physical core, that is, all the execution resources are shared between the two threads. With BD chips, you actually get two real, physical x86 cores. It's not just some hogwash, as far as performance goes AMD's solution is superior when comparing otherwise identical cores. If Intel did a similar trick with its own CPUs, they'd perform a lot better; similarly, if instead of 2 cores/module AMD had gone for 1 physical core and something like HT, they'd perform worse. The fact is, though, while the concept is sound, AMD just didn't execute it very well. Intel wins simply because the uarch is so much better, not because the two cores per module concept is bogus or that the cores aren't real. AMD's cores simply don't have enough horsepower to match SB, regardless of whether they're in tandem or by themselves (that, and the high latency/slow front-end issues) - but they're very much real, unlike HT threads.
Quote:
Originally Posted by jprovido View Post

it actually does. if HT doesn't disable on lightly threaded then you'd have very poor performance(only half performance).
It actually doesn't. Execution resources are simply assigned to both threads dynamically according to the load. Nothing is disabled; the other thread is simply given more CPU time. That's why the performance penalty is nowhere near 50% in single-threaded programs.
post #1490 of 8112
I dont think voltages are too much of an issue if temps are kept in check.


Before you bring up FPU co-processors, read the thread for a few pages. I'm not filling the forum with more processor logic theory, especially duplicates.

The easiest and shortest explanation is INT units are CMT and the FPU's are SMT, Its a hybrid of the two. This is why INT workloads scale really well while FP performance is lacking.

Further reading here...

http://en.wikipedia.org/wiki/Simultaneous_multithreading
Edited by KarathKasun - 11/21/11 at 5:16am
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