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Phenom II C3 memory questions.

post #1 of 15
Thread Starter 
1. Is there anything wrong with using 1600mhz ram with my system? Does using anything higher than 1333 limit the number of sticks/amount of memory accepted in your system? Technically my motherboard can support up to 16gb of ram. I tried 4 sticks of 2gb and it had problems at 1.6v. I don't know if it's the ram or the processor.
2. My gigabyte motherboard advetises 1666+, is that a misprint or can it really support 1666mhz memory?
3. Can someone point me a memory bandwidth calculator for all mhz/latency values?

Thanks.
post #2 of 15
1. Try raising CPU-NB voltage. The C3 should be capable of 4 DIMMs @ 1600.
2. Ignore what motherboards say about memory speed support. this is a time when the memory controller is now integrated onto the CPU.
3. (CAS / Frequency (MHz)) × 1000 = X ns; Example: (7 / 667) × 1000 = 10.4948 ns
post #3 of 15
Thread Starter 
Quote:
Originally Posted by xd_1771 View Post
1. Try raising CPU-NB voltage. The C3 should be capable of 4 DIMMs @ 1600.
2. Ignore what motherboards say about memory speed support. this is a time when the memory controller is now integrated onto the CPU.
3. (CAS / Frequency (MHz)) × 1000 = X ns; Example: (7 / 667) × 1000 = 10.4948 ns
Thanks, very informative. I thought the whole point of getting a black processor is so you don't have to raise the NB voltage for mild OCs?

What speed does the Phenom II 965 support for 2, 4 sticks and 4, 8gb of ram? (four combinations)

Is the CAS the crucial factor in terms of latency? Does leaving all other speeds at default help achieve a lower cas latency? Like instead of getting 8-8-8 (g skill says my memory can do it at 1.6v) I can get 7-9-9 instead?
post #4 of 15
On a C3 revision (ignoring size), 2 DIMMs should get you up to around just above 1900Mhz. 4 DIMMs will max out somewhere above 1700Mhz I believe if you get lucky.

The CAS and tRCD (first and second value) make the most difference
If you can get 8-8-8, chances are you can get 7-8-8
post #5 of 15
Thread Starter 
Quote:
Originally Posted by xd_1771 View Post
On a C3 revision (ignoring size), 2 DIMMs should get you up to around just above 1900Mhz. 4 DIMMs will max out somewhere above 1700Mhz I believe if you get lucky.

The CAS and tRCD (first and second value) make the most difference
If you can get 8-8-8, chances are you can get 7-8-8
Maybe I should buy some 2000mhz ram then. I'm doing audio sequencing and faster ram helps.

So how does tRCD factor into your equation?

Edit: According to your equation,

http://en.wikipedia.org/wiki/DDR_3

For standard DDR3 ram, DDR3-1600G (1600 8-8-8) should be the fastest. Is it a good idea to run faster than JEDEC standard ram? (like 7-7-7 at 1600)

Thanks.
Edited by Popple - 3/26/11 at 11:14pm
post #6 of 15
In most cases on AMD lower speed with lower timings can match higher speed with higher timings. 1600 at CL6 just about matches 2000 CL9 in the majority of apps.
Above 1333Mhz JEDEC standards sort of begin to fade out.... but nevertheless you should be fine with 1600 7-7-7. Great performance boost. However, finding 1600 7-7-7 RAM is not common... most are only max capable of 6-8-6 which is about equal
post #7 of 15
Thread Starter 
Quote:
Originally Posted by xd_1771 View Post
In most cases on AMD lower speed with lower timings can match higher speed with higher timings.
Some people said that this is no longer true. Do the AMD and Intel cpus work differently?
post #8 of 15
The Core i-series chips seem to like higher speed RAM

With the Phenom IIs, memory bandwidth can be increased by overclocking the IMC (often called CPU-NB)

I have a C3 chip as well, I have 4 sticks of RAM running at 1600MHz, and my IMC is running at 2800MHz
    
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post #9 of 15
Believe it or not, G.Skill recommend upping your ram voltage to 1.9v when running 4x 2GB F3-12800CL9D-4GBNQ sticks at 1600Mhz with a Phenom II.

I know, 1.9v for ram sounds pretty high to me too, but that is what their support ppl suggest when running at that speed with 4x 2GB sticks.

Quote:
Dear Customer

Did you manually configure memory settings in BIOS? Memory Frequency DDR3-1600, Memory timings tCL 9 - tRCD 9 - tRP 9 - tRAS 24 - Command Rate 2 , memory voltage 1.90V.

Once that is complete, everything should run fine. If not, the CPU may not be able to handle DDR3-1600; in that case you can simply operate the memory at DDR3-1333 with 8-8-8-24 timings and it will run at optimum performance.

Thank you
GSKILL SUPPORT
They also suggest upping SB and HT to 1.4v and adjusting your ram timings for Trfc to 160ns
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Crimson Basilisk
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post #10 of 15
Thread Starter 
Quote:
Originally Posted by un-nefer View Post
Believe it or not, G.Skill recommend upping your ram voltage to 1.9v when running 4x 2GB F3-12800CL9D-4GBNQ sticks at 1600Mhz with a Phenom II.

I know, 1.9v for ram sounds pretty high to me too, but that is what their support ppl suggest when running at that speed with 4x 2GB sticks.



They also suggest upping SB and HT to 1.4v and adjusting your ram timings for Trfc to 160ns
They told me to use 1.65v max for 1600mhz 8-8-8. What year was that tech support conversation from?
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