Overclocking FX53 and wcpuid....!

  • Thread starter Thread starter Chris Turner
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C

Chris Turner

Hi all,

Have overclocked my FX53 by increasing 2400mhz to 2600mhz in BIOS but wcpuid
and sisandra only report it as 2400mhz.....any ideas why?

setup:

amd fx-53 (socket 940)
asus sk8v mobo
2 x 512 OCZ 3500 reg ddr
Nvidia 5900 ultra 256mb
460w antec trupower psu

Cheers
 
| Hi all,
|
| Have overclocked my FX53 by increasing 2400mhz to 2600mhz in BIOS but
wcpuid
| and sisandra only report it as 2400mhz.....any ideas why?
|
| setup:
|
| amd fx-53 (socket 940)
| asus sk8v mobo
| 2 x 512 OCZ 3500 reg ddr
| Nvidia 5900 ultra 256mb
| 460w antec trupower psu
|
You are most likely telling BIOS to change the miltiplier. Since the CPU is
multiplier locked, BIOS ignores the change, and you run at what the chip is
locked to.
 
Chris Turner said:
Hi all,

Have overclocked my FX53 by increasing 2400mhz to 2600mhz in BIOS but
wcpuid
and sisandra only report it as 2400mhz.....any ideas why?
Click to expand...

Why bother overclocking that chip in the first place?
 
Robert Jackson Marley said:
isnt the fx-53 multi unlocked...i believe it is
Click to expand...


I thought you could only clock down with that chip and not up..
still good for shoving the fsb up tho
 
rstlne said:
He can?
Whys he asking us then ;)
Click to expand...
I often ask myself the same question.....;-)

I've asked for some info - thought that was what NG's were for!

I thought the multipliers were unlocked but any changes in the BIOS do not
carry through to windows...I'm not greatly familiar with Asus mobo's - does
the sk8v have a jumper restriction on overlocking or am I missing something
obvious?
 
Jason said:
| Hi all,
|
| Have overclocked my FX53 by increasing 2400mhz to 2600mhz in BIOS but
wcpuid
| and sisandra only report it as 2400mhz.....any ideas why?
|
| setup:
|
| amd fx-53 (socket 940)
| asus sk8v mobo
| 2 x 512 OCZ 3500 reg ddr
| Nvidia 5900 ultra 256mb
| 460w antec trupower psu
|
You are most likely telling BIOS to change the miltiplier. Since the CPU
is multiplier locked, BIOS ignores the change, and you run at what the
chip is locked to.
Click to expand...

While the Athlon 64 parts are, I don't believe the FX series of CPU's are
Multiplier locked. Quoted from the Anandtech article found here

http://www.anandtech.com/cpu/showdoc.html?i=2065&p=3

"The new FX-53 part number has obviously not changed, as its model number is
dependant upon clock speed. We will also not be seeing as significant a
performance increase from 940 to 939 pin platforms as upgrading to dual
channel from single channel will have a higher impact on performance than
moving from registered to unbuffered memory. On the 939 platform, the only
performance factor that separates the FX series from the rest of the Athlon
64 line will be its 1MB L2 cache size. Of course, to help maintain its
status as an enthusiast part, the FX series will also be completely
multiplier unlocked."

Now what his problem is...?
--
Kirbalo...

K7S5A Pro, Athlon XP 1600+
1 Gig DDR, 120 GB, nVidia GeForce 4 MX 440
SuSE Linux 9.0 Pro & XP Pro Dual Boot
Linux 2.4.21-226-athlon
5:16pm up 6 days 5:18, 3 users, load average: 1.57, 1.25, 1.15
 
At last!!! someone with the same problem!!! (Expect I've got the FX51
instead with ASUS SK8V)

I can change the multiplier and the FSB... but ALSO LIKE YOURS the
changes are not accurately reflected within Windows. Even when I set
the multiplier to x5 (i.e. 1000Mhz) the system INSISTS on speed round
about 2.2Ghz

I will be posting my results soon so all can see the sort of anomolous
results from O/C and hopefully provide some theory on why.

Can I just ask Chris, what sort of temp does your FX53 run at ? my
FX51 runs quite high idle 38-42 with a coolermaster HYPER 6
heatsink.pipe / fan it maxes between 50-60 dependant on how much
voltage I'm puttin into the processor.

Also whilst I'm posting, how long does your machine take to POST? I
have a 30sec delay AFTER the Via disk controller post but BEFORE the
successful POST message.
 
"Chris Turner" said:
I often ask myself the same question.....;-)

I've asked for some info - thought that was what NG's were for!

I thought the multipliers were unlocked but any changes in the BIOS do not
carry through to windows...I'm not greatly familiar with Asus mobo's - does
the sk8v have a jumper restriction on overlocking or am I missing something
obvious?
Click to expand...

You can start your research here:

http://www.amd.com/us-en/Processors/TechnicalResources/0,,30_182_739_7203,00.html

Our friends at AMD have made this as difficult as possible, by using
a modular documentation system. Bits and pieces of the processor design
are spread over multiple documents.

This doc is the BIOS writers guide. Pg.229 has the coding for FID
(multiplier). Basically, the FID minus 4 is the multiplier.
http://www.amd.com/us-en/assets/content_type/white_papers_and_tech_docs/26094.PDF

The Processor Power and Thermal Datasheet has some info on FID/VID.
Pg.16 shows the Start and Max FID/VID for some AthlonFX models.
http://www.amd.com/us-en/assets/content_type/white_papers_and_tech_docs/30430.pdf

Now, this FID/VID feature seems similar to the FID/VID used for
Cool and Quiet on the K8V boards. There is an interaction between
having the ability to program the FID/VID at runtime, and the ability
to overclock via setting the multiplier in the BIOS setting. If runtime
FID/VID changing is allowed, it is possible the BIOS will be prevented
(looses control, in the ACPI sense) from touching the FID/VID. This
means the "Start" values will be used. If you can find the appropriate
utility, you might even be able to change the multiplier while sitting in
Windows. But the utility might not allow overclocking (it might go from
say 800 to 2200 for example).

On a Socket 754 board, you might install cpudriver.zip from AMD,
plus a utility from Asus, to do this programming in Windows.

So, the only thing I cannot figure out, is in this particular
SK8V case, whether there is a BIOS option that disables FID/VID
changing (no power management object supported via ACPI), so that
in turn, changing the BIOS multiplier gives you direct control
and the ability to overclock. "Cool and Quiet" doesn't appear
as a term in the manual, and I don't know whether it works anyway
with this board or not. I get the impression that maybe AMD had
intended similar features to work across the Athlon64 family, but
it is hard to find that info on the AMD web site.

amd_cnq_driver.zip and amd_cnq_software.zip are used on a K8V board
to change the multiplier while in Windows, as part of "Cool and Quiet".
I don't know what would happen if you used this software on your SK8V
- maybe having a restore point would be a good idea :-) The software
might refuse to install, hard to say.

http://www.asus.com.tw/support/download/item.aspx?ModelName=K8V SE Deluxe&Type=All

Presumably this driver is the equivalent of the amd_cnq_driver.zip file
http://www.amd.com/us-en/assets/content_type/utilities/Cpudriver.ZIP

I hope even if my English composition isn't the best, that you
can see some fragments of what might be behind this not working.
If AMD made monolithic datasheets, this would be a lot easier to
figure out.

Good luck,
Paul
 
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