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MSI 870A-G55 with a Phenom II x6

post #1 of 8
Thread Starter 
Hello! I recently built a desktop using, among other things, an MSI 870A-G55 motherboard and a Phenom II x6 1090T. I have seen in several places here (notably posts by xd_1771) that it is a bad idea to use this CPU with this motherboard. Can someone explain why this is? Thanks!
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post #2 of 8
MSI boards have very weak VRMs and MOSFETs.

An X6 CPU will pull a lot of wattage from a board, and using an MSI board to power it will likely blow the VRMs and damage the CPU.

Other brands like Gigabyte and ASUS would allow you to safely run the CPU, even if they have the same 4+1 power phase. Even so, you should avoid overclocking it unless you buy a board with at least 8 power phases. I'm selling a Gigabyte 4+1 board in my sig that would handle your CPU, if you're interested.
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post #3 of 8
Thread Starter 
What is "4+1 power phase"? What are the alternatives?

I have no intention of overclocking, but I have been experiencing some issues recently which have made me look into power draw/handling. I don't particularly want to switch out motherboards, but I would rather do that and have a stable system as opposed to smoke and flames and a fancy paperweight.
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post #4 of 8
You're likely to get a failure at some point in the future.
Out of all the boards I have observed that are known for failures, the MSI 870 series boards (all variants share the same underlying VRM design) have the worst and highest failure rate.

You are at risk with any higher TDP CPU (whether x4, x6, or unlocked x2 to x4), at whatever clock speed (stock included), without or with cooling.

These series of motherboards are not to be used to run the higher end processors due to this rampant problem.

See: About VRMs & MOSFETs and Motherboard Safety thread (sig)
post #5 of 8
Quote:
Originally Posted by bananaman42 View Post
What is "4+1 power phase"? What are the alternatives?

I have no intention of overclocking, but I have been experiencing some issues recently which have made me look into power draw/handling. I don't particularly want to switch out motherboards, but I would rather do that and have a stable system as opposed to smoke and flames and a fancy paperweight.
4+1 power phase means it only has 4 voltage "regulators" for the CPU.

More power phases means the board can handle higher wattage CPUs, like the X4 or X6 phenoms.
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post #6 of 8
Thread Starter 
Quote:
Originally Posted by railfan844 View Post
4+1 power phase means it only has 4 voltage "regulators" for the CPU.

More power phases means the board can handle higher wattage CPUs, like the X4 or X6 phenoms.
How do you determine tell the number of regulators on a given motherboard? I am now seriously considering replacing my mainboard, but am not seeing that information on Newegg or Tigerdirect product pages. Thank you for all your help!
Edited by bananaman42 - 7/27/11 at 2:11pm
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post #7 of 8
Thread Starter 
Never mind. A bit of searching turned up this thread, which has a marvelous list.
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post #8 of 8
Quote:
Originally Posted by bananaman42 View Post
How do you determine tell the number of regulators on a given motherboard? I am now seriously considering replacing my mainboard, but am not seeing that information on Newegg or Tigerdirect product pages. Thank you for all your help!
Count the amount of chokes left, and sometimes above, the CPU socket.
This is a choke.
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