My build
6700k 4.0ghz
Msi m7 motherboard
ddr4 g.skill ripjaws v 3200 16gb×2
I oc my cpu at 4.6ghz, but I keep getting errors in prime95, using xmp or without xmp. I try a lot of different voltage also, same result. I when for 4.5ghz and got it stable without using xmp, just using the default at 2133. My question is, what's the top speed I can reach with my memory leaving the cpu oc at 4.5ghz?
As far as I know memory and cpu speeds are not linked anymore for intel systems, therefore the max speed would depend on the physical memory you have.
If you are getting errors with XMP enabled and disabled, and are stable at 4.5 but not 4.6, you probably need a bit more voltage for the cpu.
XMP at stock voltages and core speed works flawlessly? Also you might have been unlucky with the silicon lottery and got a not so great CPU. What also could be the problem is a motherboard with weak power delivery system that doesen't allow you to push the hardware to the limit. I'm just putting out what could be the problem but I'm not sure about any of those since you didn't gave much info.
Xmp works great with the cpu at stock, and the max voltage I when for my cpu at 4.6 was 1.38v,
But if I use Xmp while my cpu is at stock my pc either crash or I get errors in prime95.
Also last night I did another text , I set memory to 3000 and cpu to 4.5ghz, did the text but failed after 7 hours
MetalizeYourBrain
My build info is the following
Motherboard msi z170a gaming m7
Cpu skylake 6700k 4ghz unlocked
Ram g.skill ripjaws v 3200 16×2 (32ghz)
Gpu msi lightning 980ti
Psu corsair hx850i
Cooler corsair h100i v2
And I had try voltages from 1.3 to 1.38v
The voltages you've been using were missing. Looking on the internet ad the specs of the motherboard is way too beefy to not handle a 4.6GHz and XMP profile. Reading from a previous answer you gave to MobileWall you said that the XMP is stable at stock speeds and it's ustable at the same time (errors in Prime95). My suggestion is to run AIDA64 with the XMP profile on and the CPU stock to see if it crashes or not. Prime can be finicky at times. If it doesen't go for the 1.35v @ 4.5GHz speed and do the same again. Maybe 1.38v for just 100MHz more is not worth to my eyes. You could go for 1.45v but that's too much out of the comfort zone I guess and would increase the heat output too much for maybe a 100 to 200MHz more. The important thing here is also to test if the sticks you got can handle 3200MHz (it's though since they're 16GB sticks but worth trying).
Im doing one in aida64 so far 2 hours no problem with 4.5ghz 1.38v memory set to 3000, I will try xmp see if it pass the text. Will let u know how it when, thanks for ur support.
That's a good sign. AIDA is no less stressful on the CPU than Prime95 but it's a better tool for testing in my opinion. I had problems with Haswell (95°C on my 4790K @4.4GHz) but that's a known problem. On AIDA I got 75°C wich is much more realistic. Maybe try to bring the CPU voltage a tad down if you can since the CPU frequency stability in indipendent from the memory. Also I would push the CPU first over memory since that's where you can get more performance. Keep in mind that XMP speeds are not guaranteed but expected so they might be lower.
Prime95 overvolts your cpu unrealistically, and it should not be used anymore. The program was designed for cpus years ago, and just is not a good test anymore of what a cpu realistically sees. OCCT has been my test of choice although aida64 is another good one. Just don't use Prime95 anymore.
The text with xmp enable crash in 16 min, now I did another text but with the memory set manually 3200mghz and crash again, so I'm just going to stay as I was, 4.5ghz ram 3000mghz
Text was done with aida64
That's a clear sign that your RAM can't handle 3200MHz unfortunately. Still 3000MHz is really rispectable and it's not crashing.