Explain to me about BH-5 CH-5


Senior member
Aug 30, 2002
i have two sticks of 512mb OCZ pc3500 rams
I having problem going over 270fsb on AI7 with 3/2 (which should put the rams around 180mhz)
no matter what I do, it will not boot after 270fsb
I dont think CPU(2.4c M0) is maxed out cuz it runs 270, with default voltage, stock cooler, rock solid
I was looking for an answer and I was told that no matter what settings, AI7 /w CH-5 will not go over 270~275 FSB, where as with BH-5 rams it can easily hit 300fsb(granted that CPU can oc that high)
All I know right now is that my OCZs are made with CH-5 ram chips
What's the difference between BH-5 and CH-5?
How do I know which rams have BH-5?
Is one better than the other?
I think I can squeeze out 300fsb from my AI7/cpu, if I had BH-5 rams...
do you think I should trade/sell off my OCZ for other rams?
thank you


Diamond Member
Mar 30, 2004
If you're running 3:2 then you aren't even up to stock memory speeds. I doubt that 233mhz memory is holding you back when it's only running at 180.

Will it boot at 1:1 when your bus speed is set to 260-270?


Diamond Member
Sep 21, 2001
I just did research on this because I bought some Buffalo CH-5 the other day. BH-5 (and BH-6) are old chips made by Winbond which were infamous for OCing well, getting high FSBs while keeping tight timings. I think Winbond went bankrupt or something, maybe the recalled BH-5 but eventually production was stopped. Hardcore gamers bought up the BH-5 like mad after they found out it OC'd so well. Probably one of the best chips ever to OC in PC history. CH-5's can't OC that high. People have had varied results, with PC3200 they can get from 200mhz to 250mhz even. In most cases however CH-5 220mhz is good, and you should be happy if you get that.

As for how you know, I have no idea.

BH-5 is better than CH-5. I think BH-5 > *, but that's from what I've read.

Even if you sell off your OCZ, I doubt you can get BH-5. People have been looking for BH-5 for a year now...


Elite Member
Sep 30, 2003
How do I know which rams have BH-5?

I asked this question b4 and was told to remove the heat spreaders and examine the ram markings.


Platinum Member
Jan 29, 2000
BH 5 could get higher FSB's w/ less voltage than CH5 and could do 222 timings were as CH5 could only do 232, winbond is still around, they just don't make BH5 or CH5 chips anymore.


Diamond Member
Dec 29, 2000
Originally posted by: simms
I think Winbond went bankrupt or something, maybe the recalled BH-5 but eventually production was stopped.

Winbond did not go bankrupt, they're still in business.

BH-5 ICs were not recalled. They were simply phased out of production as a newer (cheaper) method of producing ICs was brought online. This happened around July/August of 2003. As it turned out, the earlier BH-5 chips OCed better at tighter timings than the newer, cheaper CH-5 replacements. That's why the BH-5's command a premium these days. They have been out of production for a year now and are possibly the bestt DDR IC's ever produced.