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AMD FX (Bulldozer) Owners Club! - Page 251

post #2501 of 8112
Quote:
Most benchmarks use AVX....Intel uses AVX to show how fast their CPUs are against AMD CPUs that use SSE3
Most real-world apps don't. I was talking about performance in actual real-world applications.
Quote:
AVX deals with Floating Point 256bit instructions
XOP deals with Integer 256bit instructions
FMA deals with both and encompasses Multiply-Add Multiply-Subtract Divide-Add* Divide-Subtract* instructions

Bulldozer can have 2x more performance in both FP and Int with AVX and XOP
Bulldozer can also then have 2x more performance in FP and Int with FMA**
(There is a IMAC in Bulldozer that does Integer Fused Multiply-Adds/Subtracts)
How does "can 200% in theory" in two different areas translate to 400% performance increase though? Wouldn't that only mean that you can, in theory, get at best twice the performance if the application is optimised for both FP and integer workloads on BD?
post #2502 of 8112
Quote:
Originally Posted by bomfunk View Post

How does "can 200% in theory" in two different areas translate to 400% performance increase though? Wouldn't that only mean that you can, in theory, get at best twice the performance if the application is optimised for both FP and integer workloads on BD?

You get 2x in AVX/XOP then you add 2x from FMA

4x AVX/XOP + FMA(400% possible improvement(More accuracy then just a normal MAC if no speed up is seen))
2x AVX/XOP(200% possible improvement(97% speedup))
1x SSE3(No improvement)
Edited by Seronx - 12/29/11 at 1:07pm
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post #2503 of 8112
Quote:
You get 2x in AVX/XOP then you add 2x from FMA

4x AVX/XOP + FMA(400% possible improvement(More accuracy then just a normal MAC))
2x AVX/XOP(200% possible improvement(97% speedup))
1x SSE3(No improvement)
Does it actually work like that?

Assuming it does, would it not only mean 400% performance in theory in parts of the program that heavily utilise a combination of these?

It's just that while the new instructions are wonderful and all and I'm sure the potential is great, I haven't seen the 400% performance compared to PhII in any tests that I've come across.
post #2504 of 8112
Quote:
Originally Posted by bomfunk View Post

Does it actually work like that?
Assuming it does, would it not only mean 400% performance in theory in parts of the program that heavily utilise a combination of these?
It's just that while the new instructions are wonderful and all and I'm sure the potential is great, I haven't seen the 400% performance compared to PhII in any tests that I've come across.

4x increases aren't actually possible but if you can make a theoretical application that can exploit such you can probably see 400%

http://ht4u.net/reviews/2011/amd_bulldozer_fx_prozessoren/index17.php

There are other benchmarks but to actually see FMA4 you need to wait for Reviewers to use Sisoft Sandra 2012 instead of the 2011 SP5 which only has FMA3(Piledriver will show a huge increase....in Sisoft don't be surprised it isn't that huge but is an increase worth mentioning)

(You can tell FMA isn't used because Multimedia FP SP or DP doesn't double anywhere)
Edited by Seronx - 12/29/11 at 2:00pm
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post #2505 of 8112
Quote:
Originally Posted by mikezachlowe2004 View Post

I was able to get these results...
I tried the 260Mhz x 20.0 Multi for 5.2Ghz and I was able to boot into windows but it is not stable. I just need more volts. It is close and if I would set the vcore voltage to 1.625v then it would be no problem. I dont think I am going to take that risk of frying my chip.
I am going to install that premature windows patch and see if I can't get it stable with that.

I think I may try my O.C. next using the FSB. Multi only takes way too much voltage. I needed 1.7v to get Benchmark Stable at 5.2Ghz. Although my Gigabyte board doesn't register OverVoltage until 1.775 (it changes to Orange, from normal color)

I tried a little while ago to do a FSB Overclock, and I did have trouble POSTing over 240FSB. I even manually set my NB to 2200 and HTT to 2600. (and my RAM)
post #2506 of 8112
Computer Restore: Did you make sure ram timings were not too tight? Also what did you have vcore and other voltages? You should be able to get past 240 fsb but maybe your chip likes multi's better.

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post #2507 of 8112
Quote:
Originally Posted by dstoler View Post

Computer Restore: Did you make sure ram timings were not too tight? Also what did you have vcore and other voltages? You should be able to get past 240 fsb but maybe your chip likes multi's better.
Sent from my SPH-M910 using Tapatalk

Yeah, I set my RAM to 1333mhz 9CLK. 1.5V. I left my NB and HTT voltages at stock, because I manually set them to their stock settings.
I'll have to play around with it a bit more. I should check my error messages when it BSOD's. One thing I'll have to check is that my PCI-e was set to auto. I'll have to set it at 100mhz, because the FSB increase is probably changing it, and could be causing the crash.

Is there anything else that gets changed by the FSB that'll I'll have to change the voltages for? Oh and yes, I am adjusting my CoreV. I can get this chip to 5.2Ghz using the Multi, but I am new to FSB Overclocking. (My old computer was a Phenom II X4 BE with a Crosshair IV)

I have done a lot of FSB O.C. on Intel chips. But that's usually just FSB+ CoreV+, RAM Multi decreased. Boot
post #2508 of 8112
Quote:
Originally Posted by ComputerRestore View Post

Yeah, I set my RAM to 1333mhz 9CLK. 1.5V. I left my NB and HTT voltages at stock, because I manually set them to their stock settings.
I'll have to play around with it a bit more. I should check my error messages when it BSOD's. One thing I'll have to check is that my PCI-e was set to auto. I'll have to set it at 100mhz, because the FSB increase is probably changing it, and could be causing the crash.
Is there anything else that gets changed by the FSB that'll I'll have to change the voltages for? Oh and yes, I am adjusting my CoreV. I can get this chip to 5.2Ghz using the Multi, but I am new to FSB Overclocking. (My old computer was a Phenom II X4 BE with a Crosshair IV)
I have done a lot of FSB O.C. on Intel chips. But that's usually just FSB+ CoreV+, RAM Multi decreased. Boot

make sure that you have the ram speeds low to overclock. Then I would try leaving HT and NB at auto or maybe x10 for NB and x11 for HT. I usually get good results with these settings. I do have to increase voltage for almost everything with these settings.

CPU - x19.5 Multi - 5070MHz - 1.525v
FSB - 260MHz
CPU/NB - x10 Mullti - 2600MHz - 1.45v
HT Link - x11 Multi - 2860Mhz - 1.325v
NB - 1.275v
CPU VDDA - 2.65v
CPU LLC - Extreme (CHV v1003)
CPU/NB LLC - High
DRAM - 2080MHz - (9-10-9-27) - 1.575v
VRM Frequency - 500MHz
PCI-e Frequency - 105MHz (OCed GPU's)

Also,
CPU - x19.5 Multi - 4875Mhz - 1.525v
FSB - 250Mhz
CPU/NB - x10 Multi - 2500MHz - 1.4v
HT Link - x11 Multi - 2750Mhz - 1.275v
NB - 1.225v
CPU LLC - Ultra High
CPU/NB LLC - High
DRAM - 2000MHz - 1.525v (9-10-9-27)

Try these settings out and let me know how it works for you.

You said you took the voltage of your 8150 chip to 1.7v? What kind of cooling were you using? I have taken mine up to 1.6v but I am kinda of iffy about going any higher.

Hope I could help... Let us know how everything goes.

Thanks
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post #2509 of 8112
New 3dmark 11 score with new gfx card.
http://3dmark.com/3dm11/2449501

P7617 3DMarks

At the limit of my PSU now tho so cant overclock cpu to 5ghz with 2X gfx cards.
post #2510 of 8112
Anyone else running on a 890 board? I installed my 4100 today but I'm getting some erroneous looking temperatures in AOD, HW Monitor, and Core Temp. Says my idle is like 6 'C, and my 100% load is only 26'C. Also I noticed that Hyper Transport Link is 2600MHZ by default. Is that right? I may have to pester MSI about this...
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