8KNXP - Corsair Twinx 3700 - Bios F8

Hi,

I have 1024mb Corsair Twinx 3700 (2 x 512mb) installed on my 8KNXP.

When I received the mainboard it had F3 bios installed, and simply
didn't recognise the memory at all. After reading some posts here, I
installed F6a(beta) and changed some of the timings and it finally
recognised the memory and ran at dual rate although at much reduced
speed.

Finally I have recently installed F8 (again after reading posts here)
and I was looking forward to the bios finally recognising the 3700
memory...but alas after running CPU-Z it shows the memory as 3200
rather than 3700 and therefore again not using the speed that I paid
for.

So my questions :

1. How do I get the 8KNXP to recognise Corsair Twinx 3700 memory?
2. Does it need to recognise it to make use of the extra available
speed?
3. Is it just CPU-Z that is not recognising the 3700?
4. Is there another way of determining whether the 8KNXP is actually
recognising the 3700?

Any help with this setup would be appreciated.

Spec :

P4C2.8 running at 3.5
FSB 985
mem : 2.5-3-3-8 running at 5:4
OS : Windows XP sp1
fx5900 128mb

Thanks.

Matt. Davies

CPUZ recognizes my 3500 as 3400,i wouldn't worry about it CPUZ is wrong. If you
set the timmings too fast it will no work should be cas3,7,3,3. 3700 just
means it's capable of running at that speed but unless you have the FSB set to
235 or higher it wont run at that speed. DOUG

(Courseyauto) wrote in message ...
CPUZ recognizes my 3500 as 3400,i wouldn't worry about it CPUZ is wrong. If you
set the timmings too fast it will no work should be cas3,7,3,3. 3700 just
means it's capable of running at that speed but unless you have the FSB set to
235 or higher it wont run at that speed. DOUG

Thanks for your reply, I'm running the FSB at 245mhz and with the
memory running at 5:4 that means that the memory is runnning at 197mhz
when it could run much higher.

My question really is, if the BIOS recognised the memory at 3700
rather than 3200, would it allow the memory to run at 1:1 at a higher
FSB? Is it changing to 5:4 earlier as I ramp up the FSB thereby
reducing the speed it runs at?

Unfortunately for some reason the CAS can only be set at 2 or 2.5.

Matt.

(Courseyauto) wrote in message
...
CPUZ recognizes my 3500 as 3400,i wouldn't worry about it CPUZ is wrong. If
you
set the timmings too fast it will no work should be cas3,7,3,3. 3700 just
means it's capable of running at that speed but unless you have the FSB set
to
235 or higher it wont run at that speed. DOUG

Thanks for your reply, I'm running the FSB at 245mhz and with the
memory running at 5:4 that means that the memory is runnning at 197mhz
when it could run much higher.

My question really is, if the BIOS recognised the memory at 3700
rather than 3200, would it allow the memory to run at 1:1 at a higher
FSB? Is it changing to 5:4 earlier as I ramp up the FSB thereby
reducing the speed it runs at?

Unfortunately for some reason the CAS can only be set at 2 or 2.5.

Matt.

.......................
With the FSB at 245 and the memory at 1:1 the memory will be at
490,it is only rated to run at 466 but you can try it. That speed of memory
will not run at cas 2,5 or 2.0, You should leave it set to SPD so it will run
at the values set in the memory SPD chip. Setting it manually will allow you
to try 2.0 and 2.5 but it is not rated to run at those low timmings. You
should got to the CORSAIR FORUMS and check out the advice there,it is monitored
by a CORSAIR rep and he will answer your questions.
It looks like if you wanted to run such a high FSB and 1:1 memory settings
you need PC4000 ram.
Here is the link to the CORSAIR FORUM.

http://www.houseofhelp.com/forums/fo...hp?forumid=128

"Matt. Davies" wrote in message
om...
(Courseyauto) wrote in message
...
CPUZ recognizes my 3500 as 3400,i wouldn't worry about it CPUZ is wrong.
If you
set the timmings too fast it will no work should be cas3,7,3,3. 3700
just
means it's capable of running at that speed but unless you have the FSB
set to
235 or higher it wont run at that speed. DOUG

Thanks for your reply, I'm running the FSB at 245mhz and with the
memory running at 5:4 that means that the memory is runnning at 197mhz
when it could run much higher.

My question really is, if the BIOS recognised the memory at 3700
rather than 3200, would it allow the memory to run at 1:1 at a higher
FSB? Is it changing to 5:4 earlier as I ramp up the FSB thereby
reducing the speed it runs at?

Unfortunately for some reason the CAS can only be set at 2 or 2.5.

No. JEDEC, the body that certifies memory standards, has not set a starndard
for anything beyond PC3200. Much of the DDR being sold as PC3500 and up is
merely overclocked PC3200. That doesn't mean they won't perform at the rated
speed.

Also, some motherboards had trouble booting with memory identified in SPD
with those higher speeds, so the memory makers altered the SPD.

My Buffalo Tech PC3700 uses different memory chips, but works much like your
Corsair. At 1:1 it will run at 230+ at 2.5,3,3,7. But to overclock my P4 2.4
to the max, I run 5:4 at 275 fsb with the ram at 220, timings of 2,3,2,6.

That's on an Abit IC7, but the principle and the chipset are the same as
your 8KNXP. It's tough to get much beyong the rated speed at 1:1, and it's
tough to reach the rated speed at 5:4. Try both and see which performs
better.

Thanks very much for all your replies.

I think that maybe I am expecting too much. I have ramped the FSB up
to 260 and it posted, but was pretty unstable, so I brought it down in
stages until it ran sandra burn-in 10 times without any problems. I
also ran 3dmark2001se, aquamark, and 3dmark03 to test the graphics but
it falls over on the CPU test stage of 3dMark03 although I have not
had any issues in the real world.

I guess I will let it settle down, and see how it goes, and probably
give it another go in the future if I have a spare weekend.

Thanks.

Matt.




"Skid" wrote in message news:yvjDb.357643$Dw6.1170889@attbi_s02...
"Matt. Davies" wrote in message
om...
(Courseyauto) wrote in message
...
CPUZ recognizes my 3500 as 3400,i wouldn't worry about it CPUZ is wrong.
If you
set the timmings too fast it will no work should be cas3,7,3,3. 3700
just
means it's capable of running at that speed but unless you have the FSB
set to
235 or higher it wont run at that speed. DOUG

Thanks for your reply, I'm running the FSB at 245mhz and with the
memory running at 5:4 that means that the memory is runnning at 197mhz
when it could run much higher.

My question really is, if the BIOS recognised the memory at 3700
rather than 3200, would it allow the memory to run at 1:1 at a higher
FSB? Is it changing to 5:4 earlier as I ramp up the FSB thereby
reducing the speed it runs at?

Unfortunately for some reason the CAS can only be set at 2 or 2.5.

No. JEDEC, the body that certifies memory standards, has not set a starndard
for anything beyond PC3200. Much of the DDR being sold as PC3500 and up is
merely overclocked PC3200. That doesn't mean they won't perform at the rated
speed.

Also, some motherboards had trouble booting with memory identified in SPD
with those higher speeds, so the memory makers altered the SPD.

My Buffalo Tech PC3700 uses different memory chips, but works much like your
Corsair. At 1:1 it will run at 230+ at 2.5,3,3,7. But to overclock my P4 2.4
to the max, I run 5:4 at 275 fsb with the ram at 220, timings of 2,3,2,6.

That's on an Abit IC7, but the principle and the chipset are the same as
your 8KNXP. It's tough to get much beyong the rated speed at 1:1, and it's
tough to reach the rated speed at 5:4. Try both and see which performs
better.