Hi,
I have an i5-2500K that was never overclocked and was sitting in an old PC that had a bad ASUS motherboard that was out of warranty. I tossed the motherboard and bought an ASRock P67 board off ebay that was in full working order. It turns out that I can only use DIMM slots B1 and B2. A1 and A2 will instantly shutdown to where the onboard diagnostics won't even stay lit to show an error code. The problem is that for dual channel memory, I need either A1,B1 or A2,B2. I can run single channel mode fine in the B channels.
So I got another motherboard off ebay, an Intel Z77 board in full working order, looks brand new, no bent pins, dust, etc. Now this board has almost the same issue. The two Channel A slots cause it to beep 3 times then reboots and never posts. The two B channel slots work fine in single channel mode whether I use 1 stick or ram or 2 sticks. I have 3 different sets of RAM, G.Skill, Kingston and Crucial. All are rated 1600 but can under clock 1333 for the Sandy Bridge cpu even though they work fine at 1600 in single channel mode.
Is it safe to assume the problem is the memory controller on the CPU or did I get two bad motherboards off ebay that just happen to have bad Channel A DIMM's? My next step was to purchase a cheap 1155 cpu to see if it behaves the same or not but wanted to post here before I spend more money and time with this. I can return both motherboards and toss the 2500K or just keep it as is with a single stick in single channel mode in one of the boards. I'm not sure if there is a way to diagnose the cpu as it appears to be perfectly fine physically.
Thanks
I have an i5-2500K that was never overclocked and was sitting in an old PC that had a bad ASUS motherboard that was out of warranty. I tossed the motherboard and bought an ASRock P67 board off ebay that was in full working order. It turns out that I can only use DIMM slots B1 and B2. A1 and A2 will instantly shutdown to where the onboard diagnostics won't even stay lit to show an error code. The problem is that for dual channel memory, I need either A1,B1 or A2,B2. I can run single channel mode fine in the B channels.
So I got another motherboard off ebay, an Intel Z77 board in full working order, looks brand new, no bent pins, dust, etc. Now this board has almost the same issue. The two Channel A slots cause it to beep 3 times then reboots and never posts. The two B channel slots work fine in single channel mode whether I use 1 stick or ram or 2 sticks. I have 3 different sets of RAM, G.Skill, Kingston and Crucial. All are rated 1600 but can under clock 1333 for the Sandy Bridge cpu even though they work fine at 1600 in single channel mode.
Is it safe to assume the problem is the memory controller on the CPU or did I get two bad motherboards off ebay that just happen to have bad Channel A DIMM's? My next step was to purchase a cheap 1155 cpu to see if it behaves the same or not but wanted to post here before I spend more money and time with this. I can return both motherboards and toss the 2500K or just keep it as is with a single stick in single channel mode in one of the boards. I'm not sure if there is a way to diagnose the cpu as it appears to be perfectly fine physically.
Thanks
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