How to Identify UTT-BH from UTT-CH ???

Hello.

I got a pair of 512MB Kreton/VT (UTT) + BP808 and was wondering how to identify if they're UTT-BH or UTT-CH.

The rules of BH-5 vs CH-5 that I know are:
- BH-5 cannot boot with CAS3
- CH-5 cannot use tRFC 12
- BH-5 usually 200Mhz <2.8v 2-2-2-X

Now, my Kreton do boot with CAS3 but also do tRFC 12. Another thing is that they need 3.1v :wth: to pass Memtest86 at 200Mhz 2-2-2-x !

Any idea? I smell they're UTT-CH but I need your experience to identify these.

Ps. They do 250Mhz 2-2-2-8 as tight as it gets 7-12-00-2-1-2 with 3.4V :slap:.

Quote:

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Originally Posted by Aleman

BH-5 usually 200Mhz <2.8v 2-2-2-X

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^
i'd say this is the rule #1 for identifying.

If you can see the chip code.....

1J-50 1C-50 etc = CH
2J-50 2C-50 etc = BH

In my experience...no guarantees unfortunately but if they pass at 2.8v 2-2-2 and have a 2X-50...they should be BH :)

ive been wondering about how to identify these blank chips, lol :p:

Please test your sticks individually. If I'm not mistaking (could be that I tested the other pair), they booted fine at 200MHz 2-2-2-10 with 2.7V in my DFI.
Could be that one stick is CH- and the other BH-based, although I doubt that. IMHO, all VT 512MB PC3200 sticks seem to be BH-based, at least the ones I had here, behaved like BH-based RAM. I got 2x 256MB VT UTT RAM that behaves differently, clearly like CH-based RAM.
BTW, what board and bios are you using?
And the thing is:
They don't need to be stable at 200MHz with a voltage under 3V, to indicate they are BH-based. If they post at a voltage of 2.7-2.9V at 2-2-2-x timings then they are usually BH-based. CH-based RAM wouldn't even post at that volts with these timings.
The fact that they might not be stable at those volts with 2-2-2-x timings, just underlines that they are UTT (UnTesTed). ;) But after a burn-in, that could change.

"Another thing is that they need 3.1v to pass Memtest86 at 200Mhz 2-2-2-x !"

they are CH.

yea, my bh-5 on my value ram will pass memtest @ 2-2-2-X w/ 2.6v

Booting @ 200MHz 2-2-2-x is not enough. My CH-UTTs boot fine @ 2.6V.

UTT-CH5 will NEVER run at trfc12... not even at 200

C

I always go by the 2-2-2-5 200fsb voltage. I've never seen CH-die memory boot with anything under 3v. BH-5 and BH-die will boot up somewhere around 2.6-2.7v.

@Charlie: Well mine do! lol

It seems I got a weird mixture coz I can boot at CAS 3 and tRFC 12.

Hey, maybe they´re UTT-DH ;) U neverknow...

I´ll test them separately, thx guys.

@Celemine. Mach dir keine Sorgen, mir ist es egal ob die CH based oder BH based sind ;).

Quote:

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Originally Posted by charlie

UTT-CH5 will NEVER run at trfc12... not even at 200

C

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My pair of TwinMos SP CH-UTT does tRFC 12 200MHz ~12h Stress Prime stable.
No recollection about voltage and such.

Guess I'm going to have to dig up the screenie... or run Prime again.

I remember that UTT´s are "improved" from their original die. So maybe the UTT-CH is that way improved so it can run tRFC 12 ;).

The real give away is operating 1T in NF2 boards at high FSB...230-240-250Mhz. BH just cant cut that.

That was the great thing about CH UTT, even not great sticks in A64....sub 250Mhz could find a happy home in NF2 systems as 512M sticks that did 1T while no others would.

yea 1T and high fsb isnt easy to get on NF2

Quote:

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Originally Posted by charlie

UTT-CH5 will NEVER run at trfc12... not even at 200

C

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Note the tRFC...
:stick:
http://www.helsinki.fi/~llounent/10h35m39s.png

Easiest way to differentiate is that BH UTT cannot do CAS 3 at all, it is a chip limitation.

UTT CH-5 chip in 0.13µm ;)

Quote:

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Originally Posted by computersmsa

UTT CH-5 chip in 0.13µm ;)

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CH = 0.15
BH = 0.17

im sure the 'UTT brand' kept the same process. i could be wrong here though about utt in respect to process size.

Quote:

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Originally Posted by RyderOCZ

If you can see the chip code.....

1J-50 1C-50 etc = CH
2J-50 2C-50 etc = BH

In my experience...no guarantees unfortunately but if they pass at 2.8v 2-2-2 and have a 2X-50...they should be BH :)

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This is in reference to OCZ Winbond BH/CH only. These IC codes listed above are specific to OCZ.

Quote:

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Originally Posted by pershoot

CH = 0.15
BH = 0.17

im sure the 'UTT brand' kept the same process. i could be wrong here though about utt in respect to process size.

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Absolutely untrue.
:)


CH-X = 0.13um
BH-X = 0.175um