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Can't run my ram at 1866 with the 8350.....

post #1 of 11
Thread Starter 
Motherboard: Gigabyte UD3 990fx rev 1.0 (running latest bios)
CPU: 8350
RAM: Corsair Vengeance 16GB (4x4GB) DDR3 1866 MHz (CML8GX3M2A1866C9B)
Video cards: 2x Gigabyte 7870's in crossfire
OS: Win 7


Problem is I can't get the ram to run at it's rated speed 1866. It defaults to 1333. I tried it at 1600 and doesn't work.
Just upgraded CPU from Phenom II 970. It was able to operate the ram at 1600.... What am i doing wrong here?

PS - I'm pretty new to this stuff so forgive my ignorance. I did search a bit for some answers on this but haven't been able to resolve.

Thanks for any assistance in advance!
post #2 of 11
I'm not sure if this applies in your case, but a few years ago I had a AM3+ Gigabyte (870 chipset) motherboard. When I tried to install a 1866 MHz 2x4 GB Vengeance memory kit it defaulted to 1333 MHz too. I got to run the memory at its rated frequency, but I had to manually adjust the timings, which is not a pleasant task. I know you said you're new to this, so I need to ask: Are you familiar with memory timings adjustment?
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a cube
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post #3 of 11
Thread Starter 
Somewhat familiar. I have been adjusting them with my limited knowledge but to no avail. I tried to set them loose at 12-12-12-36 but no luck. Any other timings that I should mess with?
post #4 of 11
Quote:
Originally Posted by Mattchooee View Post

Somewhat familiar. I have been adjusting them with my limited knowledge but to no avail. I tried to set them loose at 12-12-12-36 but no luck. Any other timings that I should mess with?

A question, was that one kit of 4X4 gb or did you buy 2 sets of 2x4?
I'd try removing 2 sticks and get it stable with 8 gb then move up.
9-10-9-27 2T bump up the voltage to 1.6 on the ram and try cpu/nb at 1.35. up to you though
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post #5 of 11
Thread Starter 
Yes, I did buy 2 sets of the 2x4. I'll give it a shot and report back. Thank you for the advice.
post #6 of 11
Quote:
Originally Posted by Mattchooee View Post

Yes, I did buy 2 sets of the 2x4. I'll give it a shot and report back. Thank you for the advice.

I see that quite often, they are only rated to run at 1866 mhz as 2x4.... not mixed with another set. It's not impossible that they would run at 1866 together, but they are not guaranteed to do so.
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post #7 of 11
Quote:
Originally Posted by cssorkinman View Post

Quote:
Originally Posted by Mattchooee View Post

Yes, I did buy 2 sets of the 2x4. I'll give it a shot and report back. Thank you for the advice.

I see that quite often, they are only rated to run at 1866 mhz as 2x4.... not mixed with another set. It's not impossible that they would run at 1866 together, but they are not guaranteed to do so.

I'v also seen issues getting AMD CPUs to tun 4 DIMMs at 1866 even on a matched set, but that was a 8120. There was quite a few posts on OCN about it as well with Bulldozer CPUs. Not sure if this is still an issue on the 8300 series or if it was caused by the motherboards. In any case, that same ram set would run 1866 on my Intel rig and was stable.
post #8 of 11
Quote:
Originally Posted by Shaded War View Post

Quote:
Originally Posted by cssorkinman View Post

Quote:
Originally Posted by Mattchooee View Post

Yes, I did buy 2 sets of the 2x4. I'll give it a shot and report back. Thank you for the advice.

I see that quite often, they are only rated to run at 1866 mhz as 2x4.... not mixed with another set. It's not impossible that they would run at 1866 together, but they are not guaranteed to do so.

I'v also seen issues getting AMD CPUs to tun 4 DIMMs at 1866 even on a matched set, but that was a 8120. There was quite a few posts on OCN about it as well with Bulldozer CPUs. Not sure if this is still an issue on the 8300 series or if it was caused by the motherboards. In any case, that same ram set would run 1866 on my Intel rig and was stable.

Bulldozer/Vishera/Llano held 9 of the top 10 frequency world records for DDR3 until Haswell come along... I assure you, the cpu is not the problem. I've run 2600 mhz as a daily clock on 2x4 gb and 2400 mhz on 4x4 gb on my Vishera rigs. Some motherboards do better than others however.
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post #9 of 11
Thread Starter 
Still not having any luck..... I did get them stable at 1600, however. I'll keep messing with them. If you have any other suggestions (or if anyone else does) I'm all ears. Would be nice to have them at 1866 if I can get them there.

Thanks for all help... I really appreciate it!!
post #10 of 11
Quote:
Originally Posted by Mattchooee View Post

Still not having any luck..... I did get them stable at 1600, however. I'll keep messing with them. If you have any other suggestions (or if anyone else does) I'm all ears. Would be nice to have them at 1866 if I can get them there.

Thanks for all help... I really appreciate it!!

What does the spd tab on cpuz look like for them?
Ryzen Shine!
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Ryzen Shine!
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24" hp @ 1900x1200 Logitech G19 PC power and cooling 910 watt silencer Thermaltake P5 
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