RAM Compatibility

[Tintai]

Hey

I have just noticed that I have two different stick of RAM.

1. Corsair Vengeance CMZ8GX3M2A1866C9
2. Corsair Vengeance CMZ8GX3M2A1866C9
3. Corsair Vengeance CMZ8GX3M2A1600C9
4. Corsair Vengeance CMZ8GX3M2A1600C9

So what I must do?

1600: 1600MHz, 9-9-9-24, 1.5V
1866: 1866MHz, 9-10-9-27, 1.5V

I think there is a problem with compatibility.

When I restore BIOS to default my RAM change speed to 1333 MHz. Why? There is a RAM or Mobo settings? And what about timings?

Thanks
~Tintai

 

[d1nky]

ive ran slower ram with faster ram and the faster seems to clock down.

but I get conflicting info from different system monitors, im not too sure what to believe.

but I would think the use the same lower frequency to stop conflicting

 

[Aquinus]

I'm not sure that XMP can run when both DIMMs have different profiles. You're going to have to manually set it to 1600 and adjust the timing if that's what you want. 1333Mhz is stock for 1155 SB chips, which is why it falls back on it. It's like when XMP isn't enabled on my rig, my DDR3-2133 runs at 1600 because that's stock for SB-E and there is a JEDEC profile for 1600.

If all the sticks were the same, XMP should work fine.

 

[Tintai]

Hmm ok. So the best solution is buy two stick 1866. Yes?
Then I remove any problems.

 

[Aquinus]

Hmm ok. So the best solution is buy two stick 1866. Yes?
Then I remove any problems.

If you want to run 1866 memory, than I would recommend that, yes. You could just run the slower of the two if you set it manually.

1600Mhz @ 9-9-9-24 should work fine if you manually configure it.

 

[de.das.dude]

manually set to 1600MHz. XMP is not a default profile. defalut max clock is 1333Mhz so after a reset the board is indeed supposed to run the RAM at 1333MHz.

werent you paying attention when you bought them?

 

[Tintai]

So tomorrow I buy two stick 1866. Thanks.
I didn't notice

 

[drdeathx]

You should be able to manually pump up the 1600MHz ram to 1866 and all is good. No need to go out and buy new ram, It will not add any performance gains unless you match the 1866 and clock up and even then, very little gain if any.

 

[Tintai]

Yea but sometimes I have a crash on 1866. I think there is a problem with different RAMs.

 

[erocker]

Yea but sometimes I have a crash on 1866. I think there is a problem with different RAMs.

They are most likely the same RAM, just the 1600mhz set can't do 1866mhz on stock voltage. Set the timings to 9 10-9-27, the voltage to 1.6v and the frequency to 1866mhz. Run MemTest to check for stability.

If stable... good.

If not... Try 1.65v or back down to 1600mhz at 1.5v.

 

[NdMk2o1o]

Yea but sometimes I have a crash on 1866. I think there is a problem with different RAMs.

It's more than likely the RAM, Corsair vengeance are shit for overclocking, I have had a 1600 set that wouldn't run 1866 either, my old gskill 1600's used to do 2133mhz

it's not worth buying 2 more sticks just to run at 1866 as the difference is marginal, just run them at 1600 and be done with it.

 

[d1nky]

my old gskill 1600's used to do 2133mhz

what could a gskill set 2133mhz hypothetically do? just bought some

and tbh 8gig of the 1866mhz should be enough. or try what erocker said.

 

[NdMk2o1o]

what could a gskill set 2133mhz hypothetically do? just bought some

Nothing really apart from adding an inch or 2 to your epeen I now have an 8gb set of 2133 that run 2400 fairly easily, haven't really tried for higher as I don't want to loosen the timings that much.

 

[Tintai]

They are most likely the same RAM, just the 1600mhz set can't do 1866mhz on stock voltage. Set the timings to 9 10-9-27, the voltage to 1.6v and the frequency to 1866mhz. Run MemTest to check for stability.

Yes I know but even in such settings there are crashes. RAM are cheap. I can but this 1866 and sell this 1600.

 

[erocker]

Okay.

 

[drdeathx]

Yea but sometimes I have a crash on 1866. I think there is a problem with different RAMs.

tune the timings down like Rock said. You wasting $ buying new ram. get these 2 to work and your golden. You will not get any performance boost. If you cannot get the 1600 MHz to 1866(which you easily should) just run both at 1600MHz.

 

[Tintai]

Ok I try. Thanks

 

[Aquinus]

what could a gskill set 2133mhz hypothetically do? just bought some

My Ripjawz 2133 (9-11-10-28) will run at 2333 stable @ 10-11-10-30. It will do 2400 but it's not always stable, at least on my 3820. I suspect IVB might clock them higher.

tune the timings down like Rock said. You wasting $ buying new ram. get these 2 to work and your golden. You will not get any performance boost. If you cannot get the 1600 MHz to 1866(which you easily should) just run both at 1600MHz.

This. You shouldn't notice a whole lot of difference between 1600 and 1866 to be honest. I would just run 1600 to be safe.

 

[Tintai]

However today I going to the marketplace and I swapped(with a small additional charge) old 4 stick of RAM to new(red) 1866. And now all problems are history.

 

[AsRock]

Not worth paying for more just run 1866 as if you do notice a difference it's just going be mild in benchmarks.

So just clock it all 1600 with the settings of the 1600 kit..

 

[Ketxxx]

I know those memory kits, their garbage on a stick. Best thing to do if you must use them is to set speed and timings manually in your BIOS/UEFI. In your case set things to 1600MHz 9-9-9-24 and you shouldn't get any problems as both kits should be using the same ICs, just one set made the higher speed grade and the others didn't.

 

[Aquinus]

Not worth paying for more just run 1866 as if you do notice a difference it's just going be mild in benchmarks.

So just clock it all 1600 with the settings of the 1600 kit..

I know those memory kits, their garbage on a stick. Best thing to do if you must use them is to set speed and timings manually in your BIOS/UEFI. In your case set things to 1600MHz 9-9-9-24 and you shouldn't get any problems as both kits should be using the same ICs, just one set made the higher speed grade and the others didn't.

You both must of missed his post. He swapped them and paid the difference which isn't a bad deal. Problem solved that way and it's usually better to run the same DIMMs anyways.

However today I going to the marketplace and I swapped(with a small additional charge) old 4 stick of RAM to new(red) 1866. And now all problems are history.