Clovertown Bsel mod

[s0lid]

Took 4mins to do it for both cpus

The instructions:


And my result, sry for quality had problems with camera :|


In use result later because don't have mobo or mems atm

[[XC] serlv]

I'm going to be doing that on one of my Clover rigs once I get some decent cooling on it. I think I know just the cooler. Been living way too long with ill-fitting Coolermasters.

[Movieman]

I'm going to be doing that on one of my Clover rigs once I get some decent cooling on it. I think I know just the cooler. Been living way too long with ill-fitting Coolermasters.

You should be doing that BSEL mod to your new chips..

Also solid, less tape, just cut a small triangle and set it on the pad with some fine point tweezers.

[s0lid]

You should be doing that BSEL mod to your new chips..

Also solid, less tape, just cut a small triangle and set it on the pad with some fine point tweezers.

Yea that is so called first revision

[[XC] serlv]

You should be doing that BSEL mod to your new chips..

Also solid, less tape, just cut a small triangle and set it on the pad with some fine point tweezers.

Ahh. Really? Can't the FSB could be dialed up in the BIOS? Not arguing. Just didn't know.

[Jaco]

Ahh. Really? Can't the FSB could be dialed up in the BIOS? Not arguing. Just didn't know.

With the Asus Z7S you don't really need the BSEL mod.
FSB can be changed in the bios , upto 500FSB I believe.

[[XC] serlv]

Nice. So, is there any advantage, at all, to doing the mod then?

[Movieman]

Nice. So, is there any advantage, at all, to doing the mod then?

Yea, on your clovers instead of booting at 2667/8mb/1066 they would boot at 3000/8mb/1333 and thats using JUST the 9 multi.
Use the 10 multi and they boot at 3330/8mb/1333 BUT they need a volt mod to run at that speed.
Now say you had a pair of X5460 Harpers.
They run at 3160/12mb/1333 with the 9.5 multi
BSEL those and you boot at 3800/12mb/1600

[s0lid]

But doesn't harps need different bsel mod?

[G.Foyle]

Pin mods are the same for all CPUs on the same socket, LGA 771 in this case.

[randomplatypi]

Noob question: What does the Bsel mod do? I googled it and found just a bunch of Oc'ing threads. If someone could point me in the right direction I would appreciate it. Thanks

[s0lid]

On clovers it makes cpus boot at 1333 instead of 1066 and on harpers 1333->1600

[randomplatypi]

Thanks!

[Big_Daddy]

On clovers it makes cpus boot at 1333 instead of 1066 and on harpers 1333->1600

Isn't that, uh. cheating?


lol Just kidding.. just kidding...

[s0lid]

Isn't that, uh. cheating?


lol Just kidding.. just kidding...

Well isn't then OCing the greatest sins ever ?

[G.Foyle]

BSEL is a group of pins (lands) in the CPU connected in different ways inside the CPU package. Internal configuration is read at boot time by motherboard to determine what is the target FSB of the installed CPU. By shorting or masking those pins in the socket, we can fool the motherboard (usually those with no OC options) to boot at higher FSB. Of course, motherboard has to support such FSB, and you can only select a value that other CPUs have. In case of Harpers we can mimic the BSEL configuration of a 333 FSB CPU (since all Harpertowns are 266 FSB), and with Clovers you can make BSEL look like an X5**2 or E5**2 (which are 400 FSB).

[Bobsama]

You have it backwards: all Clovers are FSB266 chips, Harpers are FSB333 or FSB400 chips. Is voltage automatically adjusted for a decent clock speed or can a BSEL mod fail because it doesn't have enough voltage?

[s0lid]

Nope
E53x0 clovers are 266
E53x5 clovers are 333
E54x0 harpers are 333
E54x2 harpers are 400

[G.Foyle]

True, I got the names wrong.
BSEL mod does not adjust voltage, BUT: VID (Voltage IDentification, target stock voltage) is also selected with internal configuration of several pins. You can pinmod your CPU to higher voltage as well, to make a permanent overclock which will work on any motherboard, without the need for any BIOS configuration. I can post the pin mod for LGA771 if you want.

[123bob]

True, I got the names wrong.
BSEL mod does not adjust voltage, BUT: VID (Voltage IDentification, target stock voltage) is also selected with internal configuration of several pins. You can pinmod your CPU to higher voltage as well, to make a permanent overclock which will work on any motherboard, without the need for any BIOS configuration. I can post the pin mod for LGA771 if you want.

Please do... I might need to know that...

Thx,
Bob

[Big_Daddy]

Please do... I might need to know that...

Thx,
Bob

I think this is how you do it:

[G.Foyle]

Well, it might have sounded like the mod is done and tested, but i will make myself clear now: it is only an extension of the reasoning behind BSEL mod.
My knowledge is based on:
- Intel datasheets, especially http://download.intel.com/design/xeo...hts/318589.pdf
- Shamino's VID mod on VR-Zone
I would gladly test it myself, if I had any LGA771 CPU.

PLEASE NOTE THAT THIS IS NOT TESTED. IT IS ONLY A GUESSWORK.

This is only true for X5*** series CPUs, but same method can be used to find VID mods for other CPUs.
These are the five VID pins isolated and numbered:


And this is the table of possible Vcc (Vcore) values for different VID combinations:


Best way to mod would be to check your CPU's VID (afaik CoreTemp sees it; if not, it should be on the box, where FPO code is),
then compare and find at least one 0 and one 1 that are common for your VID and your desired VID.
Then you would mask and connect the pins appropriately.
For example: you have 1.000V and you want to have 1.400V.
1.000V is:
1-1-0-0-0-1
1.400V is:
0-1-0-0-0-1
Only VID6 is different, so you just have to connect VID6 pin to ground or to another pin with ground. VID6 is easily conectable to pin AM4 (between 2 and 6) which is ground, as can be seen in the datasheet I posted. To set 0 connect pin to the ground. To set 1, mask the pin with electric tape.

[123bob]

Thx xoqolatl.

I get the idea. We will trick the mobo into supplying some other desired voltage, instead of letting it do it automatically.

I suppose this is the same scheme used to mod a socket 775 chip? I realize that you have not tested this for 771, but it looks like a reasonable thing to do, at least for us on XS!!

One thing that I wonder about is grounding a pin that is trying to be held high by the chip. If I take a "1" and ground it to make a "0", do I run the risk of blowing the logic output of that pin since it is trying to drive the line high? I could see the reverse case of driving a "0" with tape should not hurt anything since it is disconneting the chip? ...Or perhaps the outputs of the chip are buffered to prevent hurting them. ....Just rambling on here. Please excuse me.

I think I may take my crappiest quad and mess with it before actually doing this to a mainline machine. I would like to try it. The question will be when do I have the time??..... The other problem I will have is my "old farts" eyes. (I started in electronics when you could actually see the stuff. Discrete transistors were king and tubes were still commonly used...) I may have to get a higher power magnification headset, or perhaps ask my daughter to do it....

I'll have to see if it's needed on my next build, coming up this weekend.

Thx,
Bob

[Jaco]

How do you connect VID6 with pin AM4 ?
Some sort of special marker ?

I'd like to try this on my E5420's . I'm stuck at 3 Ghz now.
440x7.5 is my goal. 1.3v should be enough. (then I just need to tape VID5 , VID4 and VID1)

[jcool]

Thanks xoqolatl for comfirming my apporach, that's the way I also thought would be right.

So I'm going to do the mod for 1.35V on my X5450's, as they already have 1,25V stock I only need to ground Vid4

Stupid mobo, it undervolts to 1,21V bios and gives only 1,17V after Vdroop, so I need more juice to run 4Ghz+.