Over het probleem met de hoge AGP frequencies op bussnelheden boven de 124MHz zegt hij:
O: If you use a PCI display card, it's fully ok, right ? If you want to use an AGP card, there are still some cards that will do 133 * 2/3 = 88 MHz. At least our own i740 can perform at 88 MHz AGP clock even in 3D games (our i740 perform ok even at 100 MHz AGP clock in 2D applications, but failed in 3D applications. Some Matrox Mystique G200 cards also can perform ok at 88 MHz. I have once seen a post on a Taiwanese BBS telling that you can turn off G200's 2X AGP Mode, so it will perform ok at 100 MHz AGP clock.
If you want a safe solution, go with the diamond viper 550 TNT pci. I have tried some external circuit to implement 1/2 clock divider. It works, but this makes the agp card become a PCI device thus it can not cut-in Direct Memory Execute and Side Band Addressing. That made me give up the 1/2 clock divider solution. 1/2 agp clock divider is impossible, this is a BX chipset hardware limitation. The only safe way to use 143 MHz FSB is a PCI display card.
If you want a safe solution, go with the diamond viper 550 TNT pci. I have tried some external circuit to implement 1/2 clock divider. It works, but this makes the agp card become a PCI device thus it can not cut-in Direct Memory Execute and Side Band Addressing. That made me give up the 1/2 clock divider solution. 1/2 agp clock divider is impossible, this is a BX chipset hardware limitation. The only safe way to use 143 MHz FSB is a PCI display card.
Meer vragen van bezoekers:
NFS3: Hey oskar, can you tell us anything about the TNT/BH6/Memory problem??
O: Our Taipei test center also tested for this problem about 1 month ago, but we couldn't duplicate the situation. In my personal opinion, there are three possible reasons for the hang-up:
1. The TNT display card core requires about 3.3V/2.5A for stable operation, this causes some ATX power supplies' 3.3V ripple to become large which causes SDRAM instability or even hang-ups.
2. If you run your TNT card at 1:1 AGP clock ratio, of course it will hang-up.
3. Some SDRAM module's SPD is filled in wrong parameter to cause this problem. If the point is NO.3, we are currently working on a new bios that fixes this problem.
1. The TNT display card core requires about 3.3V/2.5A for stable operation, this causes some ATX power supplies' 3.3V ripple to become large which causes SDRAM instability or even hang-ups.
2. If you run your TNT card at 1:1 AGP clock ratio, of course it will hang-up.
3. Some SDRAM module's SPD is filled in wrong parameter to cause this problem. If the point is NO.3, we are currently working on a new bios that fixes this problem.
Donatello: 1. Why can't we have some freqency that is higher than 83 but lower than 100mhz on Abit's BX based board??? (Intel's pressure (Overclocker knows) ? Lack of BX ability? or something else?)
O: Maybe it's possible in the future , but it is impossible right now because the lack of such kind of clock generator in the market.
D: If there are no Intel's pressure and lack of BX ability form question 1, can we just have update BIOS or SoftMEnu to set 8?mhz or 9?mhz???
O: The FSB frequencies we provide are depended on the clock generator we use. So it's impossible to have extra FSB via a BIOS Update.
D: Can Abit do FSB increment like VCore??? you know, 83mhz, 84mhz, 85mhz...
O: The same answer as no.1.
D: Can we do 1/4 frequency for PCI < 100mhz? I saw Anand's review, it says BX6 v2 can do 1/4 > 100mhz. For O/C's point of view, 300A should be out soon, 333 and 366 don't have good chance to do 100mhz, but, most of them can do well on 83mhz or higher, or maybe a bit lower than 100mhz! We all know doing PCI at 83/2 is not so safe in most of the case. Many people should have BH6. So, is this possible to do 1/4 or even 1/5 for PCI with Abit's BX board? If the answer is possible, can we just do a simple BIOS update?
O: If there is clock generator with frequencies between 83 ~ 100. It must feature a 1/3 PCI clock divider. The same, it's impossible to have extra FSB via BIOS Update.
D: About setting SEL100/66# to low, can people set it with Celeron 300A ~ 400 or just can't?
O: It's useless for current Celerons. Because current Celery's SEL100/66# is right now low by default. Speed up Level 2 cache may result in instable operation.
D: Will Abit do a hardware compatible result test and post it? Too many video cards, ram, and other PCI cards are outta in the market. This will help customers a lot. Especially, Video card and ram (ram issue with BH6).
O: Maybe it's possible, we currently have test reports but we don't make them publicl. I will talk to my boss about this.
D: Any 4X AGP motherboard news from Abit? I recently heard that SiS is going to have their SiS 300 2D/3D 128bits 4X AGP chip out to the market in April. BX doesn't support 4X, right? Any new chip coming out to support this baby? GX or JX?
O: 440JX ? you mean camino ? It's code name is i820. Every mainboard maker will have 440JX based mainboards when Intel launches the camino chipset.
D: how about AMD's 95mhz K6-2 cpu? What chip do other vendors use to generate that 95 mhz?
O: 95 MHz K6-2 clock generator can not be used in intel 440BX chipset mainboard.