Is it true the Chaintech A64 board doesnt work with mobile a64's ?

CandymanCan said:

The CHAINTECH "VNF3-250" board i was ganna buy cuss it seemed perfect for me, i dont need the features the GB boards have, and reviews show this board can do 270+ fsb, i was wondering tho, iwasp lanning on getting a 3000+ 1mb L2 Mobile A64 for the board, but someone told me ina PM that the only board that works with mobiles is that Gigabyte board. The only way he said to get the Mobile to work is to have a desktop A64 and flash to Beta bios then put the Mobile but even then itll have a 4x multi .


Is this true, i dont want to get the Gigabyte board cuss i read on this one forum that like 10 people are having problems with it, plus i dont like the 2.7v for the memory that isnt enough.

Do i have to spend the extra $70 for the desktop 3200+ or will the mobile work in the chaintech board.

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CandymanCan said:

Snifff... Bar how well does the ASROCK board perform iv never even heard of that kind name before, an reviews ? I wonder if i get the chaintech board if some local pc shop will let me use thier A64 to flash the bios on the board .... LOL.

So far it seems like thier is no good board for these cpu's, at least one that overclocks well and doesnt have any problems with mobiles. The asus sure is the only one without problems but i heard that board sucks.

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BeerHunter said:

Good info bar. So this begs the question; where the hell are all the SiS boards? You know from real vendors (not that asus's asrock is'nt) that care about the OC community? Asus, Abit, MSI, DFI??

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Gautam said:

Just get the Gigabyte. It's by far the most solid out there. I don't know what this "one forum" is, but I bet they don't know what they're talking about. And as for the HTT, I don't know how many times I have to say this, but HTT != FSB. It's dependent on the processor, and as such any board can go up into the high 300's as long as PCI locks and a low enough LDT multiplier is available.

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Bar81 said:

The Gigabyte isn't a good choice simply because it stuffs every peripheral on the PCI bus.

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Gautam said:

...
And as for the HTT, I don't know how many times I have to say this, but HTT != FSB. It's dependent on the processor, and as such any board can go up into the high 300's as long as PCI locks and a low enough LDT multiplier is available.

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hitechjb1 said:

....

Overclocking setting for various bus frequencies

In A64 system, there is no external FSB per se, there are the CPU, the memory bus, the HT bus. The FSB may still be there internally to the CPU. The FSB still exists in motherboard bios to set various frequencies.

1. CPU_frequency = FSB x CPU_multiplier

2. memory_bus_frequency = CPU_frequency / CPU_memory_divider
... where CPU_memory_divider is an integer,
... in additional to the RAS/CAS timings of tRAS, tRCD, tRP, CAS.
... Can run any speed (ASYNC) using the CPU_memory_divider, to match memory module speed.
... Slow or faster memory can be used to get whatever bandwidth allowed in the memory modules.
... No memory bandwidth efficiency loss due to ASYNC in A64 (95%+ for 754)
... FSB = memory_bus_frequency (SYNC),
... e.g. FSB = 200 MHz, CPU_multiplier = x10, CPU_memory_divider = 10,
... memory_bus_frequency = 200 MHz, CPU_frequency = 2000 MHz
... In general, FSB != memory_bus_frequency (ASYNC)
... e.g. FSB = 240 MHz, CPU_multiplier = 10, CPU_memory_divider = 12,
... memory_bus_frequency = 200 MHz, CPU_frequency = 2400 MHz

3. AGP_frequency
... Can be set independently if motherboard/chipset have PCI/AGP lock such as w/ chipset Nforce3 250 GB. Not sure about the PCI/AGP lock of K8T800 Pro.
... E.g. AGP can be adjusted to hold constant at 66, 67, 68, ... MHz independent of the FSB overclocking.

4. HT_bus_frequency = FSB x HT_multiplier
... E.g. FSB = 200 MHz, 1X to 5X for HT from 200 MHz to 1000 MHz

5. CPU mulitplier is CPU specific, some can be adjusted from below up to the stock multiplier of the CPU.
E.g. A64 754 3200+, stock 2GHz = 200x10, multiplier X10, X9, X8, X7, ....

For desirable overclocking control, one should be able to set these frequencies independently as shown above. Exact bios naming may vary.

...

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@/2ct!< said:

Is it possible Chaintech could make them work with a bios revision. I hope to see how the MSI performs, though I am mad it has a 300 HTT ceiling...

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Gautam said:

Just get the Gigabyte. It's by far the most solid out there. I don't know what this "one forum" is, but I bet they don't know what they're talking about. And as for the HTT, I don't know how many times I have to say this, but HTT != FSB. It's dependent on the processor, and as such any board can go up into the high 300's as long as PCI locks and a low enough LDT multiplier is available.

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Bar81 said:

That's what I would like to know. The 755 is such a great chipset and had AGP/PCI lock long before the new nvidia boards. Asus was supposed to have one and then balked at the last minute. Same with Gigabyte. Abit has always been VIA's ***** so no surprise there. Rumor has it that we should see an Asus mobo based on the new SiS 755FX chipset from Asus. Given that Asus actually makes top flight SiS boards, I would think that's the logical choice at this point.

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