Ram's Handbook, Part 1
Winbond Ram Chips
BH-5 – The most famous of the Winbond chips, or possibly the most famous ram ever! These chips are known to love voltage, which in turn gets you extremely tight timings and great frequencies. Most BH-5 can do around 250 MHz at cas2-2-2-X. This usually requires around 3.2-3.4 volts. BH-5 has gone as high as 280 MHz or so, but this is very difficult to achieve. This ram can be identified as having the last three characters on the chip as BH-5. It has been out of production for well over a year now, so it is very difficult to find. If your motherboard does not offer above 2.8 volts, this ram is probably not for you. With the use DDR booster, this stuff can really shine. BH-5 can be found most notably in Mushkin Black Level ram, Kingston Hyper X, Corsair XMS, TwinMos, Buffalo and a few Value Ram varieties. The possibility of finding this ram on a store shelve today is almost non-existent.
CH-5 – This is a newer ram chip than BH-5 and on average cannot achieve the results BH-5 can. It is known to do around 220-230 MHz at cas2-3-2-X. This ram is a little different than BH-5 as it does not respond as well to voltage. Usually, anything over 3 volts does not yield any better results. This could be due to the manufacturer's PCB design, or simply the ram chips themselves. In some cases, however, this ram can achieve similar results to BH-5, it just does not happen very often. This is still great ram for the money and can most likely achieve cas2-2-2-X at 200 MHz with the right voltage applied. This ram is easier to find than BH-5 and usually costs a fraction of what BH-5 costs. It can be identified by the last 3 characters on the chip reading CH-5. It can be found in Corsair XMS, Kingston Hyper X, and many other offerings.
BH-6 – This is the 6ns version of the BH-X series. This ram performs very well, and in some cases, as well as BH-5 ram. Like its 5ns brother, it loves voltage and can achieve high frequency with cas2-2-2-X timings. BH-6 can usually clock to around 240-250 MHz with about 3.2-3.4 volts and still retain the tight timings. This is even harder to find than BH-5 as it is also out of production and was not produced for as long. One thing to note about this ram is that since it is 6ns rather than 5ns, you will mostly find it in PC2700 or DDR333 speeds. This is nothing to be worried about. As I said earlier, it can clock nearly as high as BH-5. Also, if 2.8 volts is your motherboard’s limit, you might want to look elsewhere. This ram can be identified by the last three characters being BH-6 on the chips. This is most commonly found in Mushkin Special 2-2-2, Corsair XMS, Kingston Hyper X, and various Value Ram models. It has been known to show up in Kingston Value Ram PC2700.
CH-6 – This is the 6ns version of the CH-X series ram. Although the cards are against a good overclock on this ram, it does alright. It performs very similar to CH-5 ram in most respects, despite its greater latency rating. Figure on about 220 MHz at somewhat tight timings such as cas2-3-2-X. This ram offers a great value, as it is usually found in less expensive modules. You can find CH-6 in some Kingston Value Ram, Corsair Value Ram and Mushkin Basic. For these prices, it is a steal.
UTT – This is the newest of the Winbond ram. It is very similar to BH-5, but requires a little more voltage. UTT ram can achieve the clocks that BH-5 can, but also requires more voltage. Most people recommend using around 3.4-3.6 volts for this ram. One thing this has over BH-5 is that its overclock is not hindered by the fact that it is double sided ram rather than single sided. BH-5 did its best when 2x256mb modules were used, and this UTT ram can achieve the same clocks using 2x512mb modules. This is very handy, as 2x256mb ram is considered not enough by most of today’s standards. One area where this ram falls short of BH-5 is that it is slightly inconsistent. BH-5 is as close to guaranteed results as you can get, where as this ram is somewhat of a hit or miss. It is also much more complicated to identify. Most people look for two small dimples in the ram chips themselves, as the ram will not say UTT on it. You must look for the winbond characteristics, which can be a real chore. Once you find a set of this, apply the right voltage, you could very well have a 1gb set of ram that will do 275 MHz at cas2-2-2-X. These ram chips are commonly found in OCZ Gold VX series, OCZ Value VX series, TwinMos Speed Premium series, Mushkin Blue and some other various Value Ram selections. This ram is very inexpensive if you can find it in the value series offerings. Figure on about $150 for 1gb of it. If you are not willing to take the risk, I would probably suggest finding some BH-5 on the used market. Update on UTT It seems there are two flavors to not in the UTT. There are the BH type chips and the CH type chips according to a few sources. The only real difference is the BH type requires less voltage at lower speeds such as 200mhz. The CH type requires at least 3 volts usually to boot at 200mhz 2-2-2. In the end, the two tend to overclock the same with the same amount of voltage. If you are on a lower voltage system, try to find the BH type chips.
Winbond Ram Chips
BH-5 – The most famous of the Winbond chips, or possibly the most famous ram ever! These chips are known to love voltage, which in turn gets you extremely tight timings and great frequencies. Most BH-5 can do around 250 MHz at cas2-2-2-X. This usually requires around 3.2-3.4 volts. BH-5 has gone as high as 280 MHz or so, but this is very difficult to achieve. This ram can be identified as having the last three characters on the chip as BH-5. It has been out of production for well over a year now, so it is very difficult to find. If your motherboard does not offer above 2.8 volts, this ram is probably not for you. With the use DDR booster, this stuff can really shine. BH-5 can be found most notably in Mushkin Black Level ram, Kingston Hyper X, Corsair XMS, TwinMos, Buffalo and a few Value Ram varieties. The possibility of finding this ram on a store shelve today is almost non-existent.
CH-5 – This is a newer ram chip than BH-5 and on average cannot achieve the results BH-5 can. It is known to do around 220-230 MHz at cas2-3-2-X. This ram is a little different than BH-5 as it does not respond as well to voltage. Usually, anything over 3 volts does not yield any better results. This could be due to the manufacturer's PCB design, or simply the ram chips themselves. In some cases, however, this ram can achieve similar results to BH-5, it just does not happen very often. This is still great ram for the money and can most likely achieve cas2-2-2-X at 200 MHz with the right voltage applied. This ram is easier to find than BH-5 and usually costs a fraction of what BH-5 costs. It can be identified by the last 3 characters on the chip reading CH-5. It can be found in Corsair XMS, Kingston Hyper X, and many other offerings.
BH-6 – This is the 6ns version of the BH-X series. This ram performs very well, and in some cases, as well as BH-5 ram. Like its 5ns brother, it loves voltage and can achieve high frequency with cas2-2-2-X timings. BH-6 can usually clock to around 240-250 MHz with about 3.2-3.4 volts and still retain the tight timings. This is even harder to find than BH-5 as it is also out of production and was not produced for as long. One thing to note about this ram is that since it is 6ns rather than 5ns, you will mostly find it in PC2700 or DDR333 speeds. This is nothing to be worried about. As I said earlier, it can clock nearly as high as BH-5. Also, if 2.8 volts is your motherboard’s limit, you might want to look elsewhere. This ram can be identified by the last three characters being BH-6 on the chips. This is most commonly found in Mushkin Special 2-2-2, Corsair XMS, Kingston Hyper X, and various Value Ram models. It has been known to show up in Kingston Value Ram PC2700.
CH-6 – This is the 6ns version of the CH-X series ram. Although the cards are against a good overclock on this ram, it does alright. It performs very similar to CH-5 ram in most respects, despite its greater latency rating. Figure on about 220 MHz at somewhat tight timings such as cas2-3-2-X. This ram offers a great value, as it is usually found in less expensive modules. You can find CH-6 in some Kingston Value Ram, Corsair Value Ram and Mushkin Basic. For these prices, it is a steal.
UTT – This is the newest of the Winbond ram. It is very similar to BH-5, but requires a little more voltage. UTT ram can achieve the clocks that BH-5 can, but also requires more voltage. Most people recommend using around 3.4-3.6 volts for this ram. One thing this has over BH-5 is that its overclock is not hindered by the fact that it is double sided ram rather than single sided. BH-5 did its best when 2x256mb modules were used, and this UTT ram can achieve the same clocks using 2x512mb modules. This is very handy, as 2x256mb ram is considered not enough by most of today’s standards. One area where this ram falls short of BH-5 is that it is slightly inconsistent. BH-5 is as close to guaranteed results as you can get, where as this ram is somewhat of a hit or miss. It is also much more complicated to identify. Most people look for two small dimples in the ram chips themselves, as the ram will not say UTT on it. You must look for the winbond characteristics, which can be a real chore. Once you find a set of this, apply the right voltage, you could very well have a 1gb set of ram that will do 275 MHz at cas2-2-2-X. These ram chips are commonly found in OCZ Gold VX series, OCZ Value VX series, TwinMos Speed Premium series, Mushkin Blue and some other various Value Ram selections. This ram is very inexpensive if you can find it in the value series offerings. Figure on about $150 for 1gb of it. If you are not willing to take the risk, I would probably suggest finding some BH-5 on the used market. Update on UTT It seems there are two flavors to not in the UTT. There are the BH type chips and the CH type chips according to a few sources. The only real difference is the BH type requires less voltage at lower speeds such as 200mhz. The CH type requires at least 3 volts usually to boot at 200mhz 2-2-2. In the end, the two tend to overclock the same with the same amount of voltage. If you are on a lower voltage system, try to find the BH type chips.
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