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A7N8X 400 FSB

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May 5, 2003 3:10:47 AM

http://usa.asus.com/prog/spec.asp?langs=09&m=A7N8X Deluxe

looks like revision 2.0 gets the 400 FSB. Man that makes me mad because I have revision 1.4

XP 2800+ (thor B); Asus A7N8X Delux; Maxtor 40/120 gig ATA 133; AIW9700 RadeonPro; Corsair PC3200 (2X256); LiteOn CDRW; Sony DVD-+RW; Antec Case; Antec TruePower 550; many many fans; WinXp

More about : a7n8x 400 fsb

May 5, 2003 5:07:17 AM

Yea, you got to be careful & look out there right now to get the A7N8X Deluxe 2.0 as well. I just had to RMA a 1.2 board that the ad said supported 400 FSB. They didn't have a problem RMAing it, but it's ended up taking a week so far. Not fun looking at this XP2500 retail & 2 x 256 Kingston Hyper X sticks of DDR 400 sitting here on the computer desk in front of me & no board to put it in yet.

If it ain't broke, take it apart & see why not!
May 5, 2003 6:28:23 AM

you're lucky you could RMA it. I got mine back in feb., and there is no way they would take it back as the box it came in clearly stated 333 FSB only.

XP 2800+ (thor B); Asus A7N8X Delux; Maxtor 40/120 gig ATA 133; AIW9700 RadeonPro; Corsair PC3200 (2X256); LiteOn CDRW; TDK 420N DVD+RW; Antec Case; Antec SL350; many many fans; WinXp
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May 5, 2003 7:35:12 AM

I'm kind of disappointed with ASUS for that. I put together 4 or 5 of them for people with them thinking that they could run the 400 FSB as well. It didn't really come out to my knowledge until the Rev. 2.0 board. It just seems kind of under handed in my opinion. I've used ASUS boards for years & this just bothers me a bit. The reason I waited so long was because I thought that the first few rev.'s were a little buggy with RAM. Now I'm glad I did wait awhile. I just lucked out.

Your not the only one with those revisions that won't be able to get the 400 FSB support with a BIOS update. Sorry about that man.

If it ain't broke, take it apart & see why not!
May 5, 2003 9:28:59 AM

Is there anyway to tell if you got/are selling the a7n8x rev2.0, instead of just looking at the number on the board. Is the color different, anything at all?
May 5, 2003 11:53:08 AM

Not that I know of other that what I said. On Asus web site it says to look at the silk screen print on the board to tell. Being that I RMAed the wrong board I haven't seen a rev. 2.0 yet.

If it ain't broke, take it apart & see why not!
May 5, 2003 12:13:01 PM

Not only does it not support 400, but if I run my FSB at 400 on my rev 1.4, POST displays my cpu as a duron 1100, with an fsb of 100mhz. Whaddup wit dat? I put it up to 202 and it's back to normal. Put it back down to 199, back to normal. Kinda funny. I'd run it higher, but I get higher clock speeds running a little slower, at my nice 191x11.5 (hooray for 2293 mhz!)

2500+ Barton 191x12@1.85v=2293mhz
Tr SLK-800
Tt Smartfan II
A7N8X Dlx
2x512MB Corsair PC3200
BBA 9700 Pro AIW
2x80GB 7200RPM Maxtor
Guillemot Game Theatre XP
May 5, 2003 7:52:55 PM

Seems to me that Asus always does this.
About a year ago I bought an A7V333 and at that time all the reviews of motherboards with the VIA Apollo KT333 chipset motherboards stated that they supported 200/266/333 FSB cpus.
Today I want to upgrade my XP2100+ to a Barton, and now I learn that only revision 2.X A7V333 motherboards support 333FSB. I'm really pissed.
A friend bought a Gigabyte 7VARXP at the same time I bought my A7V333 and his motherboard supports 333FSB cpus. From this experience I realize that Asus products are not as good as they say. Next time I'll get a Gigabyte or an MSI.


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It's not important to know all the answers, as long as you know how to contact someone who does.
May 5, 2003 9:06:10 PM

i'd like to sell my used one on Ebay, and get a rev. 2.0!! I bought the damb PS3200!!! Though I am pissed that they did this, they should just call it something else altogether as it smacks of software vendors who reelase their software too early so that WE can debug it, I know their site too well then to leave it. I noticed that they no longer have a forum anymore. My guess is that people complained too much. Corsaire's forum . . . that is what it should look like.

XP 2800+ (thor B); Asus A7N8X Delux; Maxtor 40/120 gig ATA 133; AIW9700 RadeonPro; Corsair PC3200 (2X256); LiteOn CDRW; TDK 420N DVD+RW; Antec Case; Antec SL350; many many fans; WinXp
May 5, 2003 11:41:37 PM

they should allow trade-ins and for a charge, give us the rev 2 board. it'd be a good PR move.

XP 2800+ (thor B); Asus A7N8X Delux; Maxtor 40/120 gig ATA 133; AIW9700 RadeonPro; Corsair PC3200 (2X256); LiteOn CDRW; TDK 420N DVD+RW; Antec Case; Antec SL350; many many fans; WinXp
May 19, 2003 12:40:41 AM

Yeah but the A7V333 I own apparently can operate at 333FSB even though ASUS isnt clearly saying it on their support site, I was told this by CS http://usa.asus.com/prog/spec.asp?langs=09&m=A7V333
Is it possible a BIOS update can provide for the 400FSB? Dont forget that if you use 2 256sticks or RAM it drops to 333FSB anyway.
Hope it helped,
Jim
May 19, 2003 2:57:28 AM

I think that was what I was trying to refer to above - pls forgive me, I am new, and intimidated.
Jim
May 19, 2003 4:19:01 AM

Don't be intimidated. You were on the right path. I was replying to the post above yours, and basically just "bumping" the thread back to the top with the new information. 400MHz FSB support for A7N8X boards before revision 2.0 has been a hot topic for the last few weeks, and I wanted these guys to know that the didn't have to resort to selling their boards or abandoning ASUS. After all, AMD didn't start plans on bumping up the FSB again until after the A7N8x was released, and they just couldn't get it to run stable at 400MHz until recently. In fact, it really only appears to be a reaction to Intel's 800MHz FSB along with their setbacks with the Athlon64.
I'm sure they probably had similar problems with 333 when it was introduced. Sometimes these guys just don't understand that redesigning electronics can't be done at the drop of a hat. It's truly fortunate that ASUS was able to patch this issue with something as simple as a BIOS update. Heck, I wish I could zap the onboard computer on my truck and get an extra 25 Horsepower.

<A HREF="http://rebturtle.com" target="_new">rebturtle</A>
<A HREF="http://www.geocities.com/rebturtle/TurtleTech.html" target="_new">My System</A>
May 19, 2003 5:04:08 PM

keep in mind that this new 400 FSB is for CPU's that support that like the XP3200+. So don't expect anything new for XP2800+ bartons or thors. They are clocked for a 166 FSB (333). I have the new 1004 BIOS already. There are still some issues some are seeing like multiplier settings that are missing and still awaiting the SATA data corruption fix.

XP 2800+ (thor B); Asus A7N8X Delux; Maxtor 40/120 gig ATA 133; AIW9700 RadeonPro; Corsair PC3200 (2X256); LiteOn CDRW; TDK 420N DVD+RW; Antec Case; Antec SL350; many many fans; WinXp
May 19, 2003 11:49:41 PM

I ran 400 fsb succesfully on my rev 1.4 board, well for 1 night at least. I was running my Athlon XP 2400 @ 2.41 ghz and 400 fsb for a night. I have watercooling so i decided to see what i could do. After that, i tried to change some stuff in bios and my MB took a crap on me =/ The bios froze and wouldn't boot. I hit the CMOS reset jumper - still nothin. I RMA'd it stating a bad bios chip. Hope i get a rev 2.0 board =P (still waiting)

My system -

2400 XP
512 Kingston 2100
256 Kingston 2100
Raidmax 500w
Asus A7n8x deluxe
Koolance Exos
May 20, 2003 12:16:59 AM

From Asus Press
: : New BIOS for A7N8X Series to Upgrade to Athlon XP 3200+ with 400 FSB

Current owners of ASUS A7N8X series motherboards are in luck. ASUS now offers a new BIOS for these popular motherboards, based on PCB 1.06 or earlier version, to support AMD's latest Athlon XP 3200+ with 400MHz FSB. Download the BIOS from

A7N8X series motherboards based on the PCB 2.0 support the Athlon XP 3200+ and 400MHz right out of the box.
May 20, 2003 12:17:00 AM

From Asus Press
: : New BIOS for A7N8X Series to Upgrade to Athlon XP 3200+ with 400 FSB

Current owners of ASUS A7N8X series motherboards are in luck. ASUS now offers a new BIOS for these popular motherboards, based on PCB 1.06 or earlier version, to support AMD's latest Athlon XP 3200+ with 400MHz FSB. Download the BIOS from

A7N8X series motherboards based on the PCB 2.0 support the Athlon XP 3200+ and 400MHz right out of the box.
May 20, 2003 2:10:49 PM

Quote:
PCB 2.0 boards still must have BIOS ver 1004 or higher to access 400MHz FSB.

I guess I don't get that myself. There's a jumper on the board for 200 FSB. From page 21 in my manual:
Quote:
This jumper when set to 1-2 pins (default), enable support for Front Side Bus 333/266. When set to pins 2-3, it sets support for FSB 200 only.

So to me that tells me it's not the BIOS that I need to run 400 FSB, it's jumper driven. My V 2.0 came with BIOS 1003 on it. I haven't flashed it yet. Course I always use ASUS Update to do it.

Honey, what's that smell? Don't bother me now I'm working on my computer! OOPS!
May 21, 2003 2:20:05 AM

Quote:
*mental note: 200MHz FSB=100MHz core clock (DURON!)*

I don't know what your saying. All AMD's are dual pumped. So 200MHz FSB x 2 = 400 FSb = (Barton). That's how I see it.

Do you run this board or are you guessing?


Honey, what's that smell? Don't bother me now I'm working on my computer! OOPS!
May 21, 2003 2:45:38 AM

200 MHz <i>is</i> the FSB speed of an older AMD Duron Processor. It has an internal clock of 100MHz double-pumped <i>to</i> 200MHz (FSB <font color=red>DIVIDED </font color=red>by 2 equals CPU CORE CLOCK SPEED, and vice versa. You don't multiply the Front Side Bus speed by any number to get the Fornt Side Bus Speed!). I understand that it can get very confusing at first. You have to realise the difference between the Internal Clock speed, which only applies to the processor itself, and the front side bus, which applies to how fast the CPU communicates with other parts of the system. The Athlon processors have internal clocks of 133(266 FSB), 166(333 FSB), and now 200(400 FSB) MHz. This board allows the use of a jumper to manually <font color=red>limit</font color=red> the Internal clock speed on older/cheaper Duron CPUs.
-To see what I have in my case, click on the link below.

<A HREF="http://rebturtle.com" target="_new">rebturtle</A>
<A HREF="http://www.geocities.com/rebturtle/TurtleTech.html" target="_new">My System</A>
May 21, 2003 3:17:53 AM

Hum. I've got to mull this over a bit. I'm confused. Thanks for explaining it to me. I've got to think on it a bit.

So what your saying is that jumper sets up the board for a 100 Duron? so the the other 2 settings on the jumper would also be divided in half as well? Then what would they be setting? I don't get it.

Honey, what's that smell? Don't bother me now I'm working on my computer! OOPS!
May 21, 2003 4:44:22 AM

Sorry, I could have laid that post out a little better. I was in a hurry. Here's the number jumble, as simply as I can put it.
Your CPU frequency is calculated by multiplying the <font color=blue>Core Clock Speed</font color=blue> times the<font color=red> Clock Multiplier</font color=red>. Examples:
Duron 800 ~ <font color=blue>100MHz</font color=blue> x <font color=red>8</font color=red> = 800MHz
1GHz Athlon ~ <font color=blue>133MHz</font color=blue> x <font color=red>7.5</font color=red> = 1000MHz
Athlon XP 2000+ ~ <font color=blue>133MHz</font color=blue> x <font color=red>12.5</font color=red> = 1666MHz
Athlon XP 2400+ ~ <font color=blue>133MHz</font color=blue> x <font color=red>15</font color=red> = 2000MHz
Athlon XP 2800+ ~ <font color=blue>166MHz</font color=blue> x <font color=red>12.5</font color=red> = 2080MHz
Athlon XP 3200+ ~ <font color=blue>200MHz</font color=blue> x <font color=red>11</font color=red> = 2200MHz

The <font color=green>Front Side Bus</font color=green> speed will be (for AMD systems) twice the <font color=blue>core clock</font color=blue>. This is where you will get 200, 266, 333, and 400 from.

Duron 800 ~ <font color=blue>100MHz</font color=blue> x <font color=red>8</font color=red> = 800MHz > <font color=green>200MHz</font color=green>FSB
1GHz Athlon ~ <font color=blue>133MHz</font color=blue> x <font color=red>7.5</font color=red> = 1000MHz > <font color=green>266MHz</font color=green>FSB
Athlon XP 2000+ ~ <font color=blue>133MHz</font color=blue> x <font color=red>12.5</font color=red> = 1666MHz > <font color=green>266MHz</font color=green>FSB
Athlon XP 2400+ ~ <font color=blue>133MHz</font color=blue> x <font color=red>15</font color=red> = 2000MHz > <font color=green>266MHz</font color=green>FSB
Athlon XP 2800+ ~ <font color=blue>166MHz</font color=blue> x <font color=red>12.5</font color=red> = 2080MHz > <font color=green>333MHz</font color=green>FSB
Athlon XP 3200+ ~ <font color=blue>200MHz</font color=blue> x <font color=red>11</font color=red> = 2200MHz > <font color=green>400MHz</font color=green>FSB

What is probably the most confusing factor in all of this to the beginner is that many people refer to the Core Clock as the FSB. In fact, one of the only times you'll see or hear about the true core clock is with the BIOS settings. You will see this in <i>numberous</i> posts from people freaking out because they have a 333MHz FSB CPU, but the BIOS only "allows" them to go up to 166, etc.

--Everyone, please tell me if anything here is incorrect. I don't want to be responsible for putting out bad info.

<A HREF="http://rebturtle.com" target="_new">rebturtle</A>
<A HREF="http://www.geocities.com/rebturtle/TurtleTech.html" target="_new">My System</A><P ID="edit"><FONT SIZE=-1><EM>Edited by rebturtle on 05/20/03 10:13 PM.</EM></FONT></P>
May 21, 2003 4:44:22 AM

Okay, in reference to the Mobo jumpers. Have you ever had the system hang and reboot, or install a new CPU, and suddenly the CPU is at a lower frequency than it should be?. It usually involves going into the BIOS and setting/re-setting the core clock back to normal. For instance my CPU will revert from 133MHz to 100MHz.
It's my guess that changing that jumper will allow a CPU with a "normal" core clock of 100MHz to run even <i> slower</i> for safe mode, etc. Of course I'm just speculating, because who'd put a Duron ito an A7N8x? It's probably just a matter of legacy report. <P ID="edit"><FONT SIZE=-1><EM>Edited by rebturtle on 05/20/03 10:34 PM.</EM></FONT></P>
May 21, 2003 9:04:19 AM

yes, during post (i think) and under any program that tells you the statistics of your hardware it will tell you this:

asus a7n8x2.0 rev 1.xx (it gives me the xx because i'm using c1.05 beta 2 drivers

I purposly waiting until 2.0 came out because so many people were having problems with the sound and stuff, and revision 1's are always buggy (hence 266, 266a, 333, 333a, 400, 400a) its just bound to happen, the later versions usually fix all the hardware bugs. I paid a premium though, even though its an "older" board now, i had to pay full new board price for it. But i guess 150 isn't much over 125-130 for the best MB on the market :) . I think i got mine from pc express, didn't have any problems with them.

"sixth sick sheik's sixth sheep's sick"
*grabs a stick and places it into the flames; mmmm, smores*
%Think before you act would be a good motto%
May 21, 2003 9:11:24 AM

ya but the damn thing posts so fast its hard to pause it quick enough to see the "dual channel operation" notice.

:) .

"sixth sick sheik's sixth sheep's sick"
*grabs a stick and places it into the flames; mmmm, smores*
%Think before you act would be a good motto%
May 21, 2003 9:31:05 AM

is that why my stupid computer keeps telling me i have a duron running at 1.84ghz under 3dMark2001 it keeps telling me i have a duron...lol.

"sixth sick sheik's sixth sheep's sick"
*grabs a stick and places it into the flames; mmmm, smores*
%Think before you act would be a good motto%
!