What are the maximum safe core and CPU-NB voltages for the 880k?
Don't exceed 1.45v on either, ideally keep your CPU Vcore under 1.4v. Not going to damage it, but past that you've passed the point of diminishing returns.
System becomes unstable when CPU core is set below 1.475volts. CPU-NB can run at 1900Mhz with 1.237volts.
My goal is to get the CPU-NB to 2200Mhz. I can get 2100Mhz with 1.237volts. I cannot get 2200Mhz with up to 1.325volts so far. What does it take to get 2200Mhz? Is it even possible? If these processors can handle 2133Mhz RAM why cant the NB run past 2100Mhz?
My NB runs at 2600mhz, but you'll only notice a difference in specific benchmarks, such as the AIDA Cache & Memory Benchmark, as you're only talking about nanoseconds difference in access times and perhaps a few hundreds of MB/s difference in reads and writes in systems which aren't RAM dependent the way servers and HPCs are.
Also I forgot the default voltage on the 880K was 1.425v, but you shouldn't have to use 1.475v unless you're overclocking and not telling us.
That picture shows a socket AM3+ FX-8350 processor. I am talking about a socket FM2+ Athlon X4 880K processor. I have a ASRock FM2A88 Pro3+ motherboard with four G.Skill F3-2133C10-8XMG sticks of RAM running at 1866MHz with 1.6volts.
My motherboards default settings for my Socket FM2+ Athlon X4 880K processor are: Base clock 100MHz, Core multiplier x40 (x42 boost) CPU-NB x18, Core voltage 1.4875, CPU-NB voltage 1.275.
I have toggled APM and spread spectrum and it has no positive effect. Temperatures are fine, I have two 14cm intake fans at the top of my case.
I know that, my point was to emphasize where an increased NB speed will show an advantage.
Also you just provided the key piece of information which you should have provided at the start: your motherboard model. If ASRock > FM2A88M Pro3+ is your motherboard and http://www.cpu-world.com/CPUs/Bulldozer/AMD-Athlon%20X4%20880K.html is your processor, then your motherboard does not support that processor as it does not support 125w processors. ASRock > FM2A88M Pro3+ CPU Support List
The Athlon X4 880K is a 95 watt processor. The ASRock FM288M Pro3+ supports this processor and processors up to 100 watts.
Doom uses well over 4gigs of ram at a time so I'm sure higher northbridge speeds will make a difference.
Has AMD themselves even figured out the max voltages? I know they took a while to list the max temps for the early FX processors.
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