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» Channels :: Mainboard
MSI 645 Ultra Socket-478 motherboard
By CPU-zilla
Category : Mainboard
Published by Jimmy Tang on Monday, 18th March, 2002
Rating : 4 out of 5 stars  
Price : SGD235


The Likes

Overclockers would particularly like the 645 Ultra as it gives the user many options to tweak and change your clock settings for optimizing the performance and stability. The BIOS feature 1MHz FSB tweaking for the overclockers to change the CPU's front side bus frequency from 100MHz to a whopping 200MHz. All this is done easily in the BIOS.

The CPU:DRAM clock ratio can also be adjusted to fit the FSB frequency settings, making it extremely versatile to adjust for the correct type of DDR memory technology you're using. Here's roughly what you can do with the overclocking options you find in the 645 Ultra.

CPU:DRAM Clock Ratio
CPU FSB Clock Setting Options (CPU:DRAM) Actual DRAM speed
100MHz 1:1 200MHz
3:4 266MHz
3:5 333MHz
101 - 132MHz 1:1 202 - 264MHz
3:4 269 - 352MHz
3:5 337 - 440MHz
133 - 160MHz 4:3 200 - 240MHz
1:1 266 - 320MHz
4:5 333 - 400MHz
161 - 200MHz Auto (5:3) 193 - 240MHz

As you can see from the table above, no matter what FSBs you select, there are always settings to allow you to change the DRAM clock to use either DDR200, DDR266 or DDR333 memory. One of the most interesting future application is the ability to overclock your processor to run at 133MHz FSB (533MHz system bus) and yet have the ability to maintain using either DDR200, DDR266 or DDR333 memory. However, when the clock speed is set above 161MHz, the option will drop to just 'Auto' and you'll not be able to adjust the DRAM speed. Fortunately, the BIOS will indicate the speed of the DRAM at every FSB setting and we managed to calculate the exact ratio used.

The 645 Ultra also supports CPU core voltage adjustments via the BIOS setup. The board will only allow you to add voltage in 25mV steps up to the maximum of 1.85V.

Also, those who intend to modify their graphics card with huge heatsinks, the 645 Ultra would be one of the boards you should consider. Giving you ample space between the AGP and your first PCI slot, the board layout can let you accomodate a heatsink the size of a PCI slot. Since the space is empty to begin with, you will not waste any PCI slots to bulky heatsinks. This is one of those rare boards that adopt such a unique design - although I'm pretty sure MSI did not leave that space empty on purpose.

There is enough space between the AGP port and the first PCI slot to accomodate one of those modified graphics card with big fan/heatsink.


The AGP catch featured on the 645 Ultra, although common, is testament to MSI's dedication to quality and detail.

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