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4-4-4-12 to 4-4-4-3 Timings - Page 2

post #11 of 27
That timing will mainly affect stability a lot and bandwidth not so much. If you want to change a lot, change the 2nd number (4-3-4-12) and change the trc timing to the mid teens. That will yield a lot more bandwidth and not affect stability as much as something like CAS would. Good luck
    
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post #12 of 27
Thread Starter 
Quote:
Originally Posted by DuckieHo View Post
Are you sure that you are stable?

The last value should be the first two values combined or greater.
It should be with 2.2v. I'll do some tests in the morning. It's 3.26 AM! D:
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post #13 of 27
Quote:
Originally Posted by TaiDinh View Post
It should be with 2.2v. I'll do some tests in the morning. It's 3.26 AM! D:
No.... as in CAS + tRCD => tRAS

Your tRAS is lower than your CAS+tRCD...
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post #14 of 27
On the subjest of timings, would there be a significant performance increase of 4-4-4-12 1T vs 4-4-4-12 2T? Since moving to DDR2 I've only really seen 2T timings, but since I flashed to P29 bios on my eVGA, I've been running my G.Skill (not HZs) at 1T without a problem, even ran memtest twice. I know it made a differance in DDR...
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post #15 of 27
Quote:
The last value should be the first two values combined or greater.
What says who? I have never heard that one before..so I am interested in why

Plenty of RAM is capable of running tight sub-timings..with tras less than 8..

I would see how high you can OC it using those timings...then run the superpi.
post #16 of 27
Quote:
Originally Posted by DuckieHo View Post
Are you sure that you are stable?

The last value should be the first two values combined or greater.
I need to know why, because I'm running 3-3-2-0 right now on my CE-5's, and I did so too with my PROMOS.

*EDIT*

DDR, not my sig rig.
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post #17 of 27
Quote:
Originally Posted by DuckieHo View Post
Are you sure that you are stable?

The last value should be the first two values combined or greater.
Not always, the PC2-8000 G.Skill HZs are 4-4-4-5 stock, thats not the first 2 values combined.

http://www.newegg.com/Product/Produc...l%2bpc2%2b1000
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post #18 of 27
Quote:
Originally Posted by ericeod View Post
On the subjest of timings, would there be a significant performance increase of 4-4-4-12 1T vs 4-4-4-12 2T? Since moving to DDR2 I've only really seen 2T timings, but since I flashed to P29 bios on my eVGA, I've been running my G.Skill (not HZs) at 1T without a problem, even ran memtest twice. I know it made a differance in DDR...
Benchmark yes... Real life application, havent noticed. Running my G.Skill HZ @ 1T right now.
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post #19 of 27
There's a better explaination out there but I can't find it now. However, I can summarize....


http://www.amd.com/us-en/Processors/...E13335,00.html

CL-tRCD-tRP-tRAS-Command Rate

Quote:
CAS Latency
Certainly, one of the most important timings is the CAS Latency, which is also the one most people understand. Since data is often accessed sequentially (same row), the CPU need only select the next column in the row to get the next piece of data. In other words, CAS Latency is the delay between the CAS signal and the availability of valid data on the data pins (DQ). The latency between column accesses (CAS) then plays an important role in the performance of the memory. The lower the latency, the better the performance. However, the memory modules must be able to support low-latency settings.

tRCD
tRCD is the delay from the time a row is activated to when the cell (or column) is activated via the CAS signal and data can be written to or read from a memory cell. When memory is accessed sequentially, the row is already active and tRCD will not have much impact. However, if memory is not accessed in a linear fashion, the current active row must be deactivated and then a new row selected/activated. In such an example, low tRCD's can improve performance. However, like any other memory timing, putting this too low for the module can cause in instability.

tRAS
tRAS is the time required before (or delay needed) between the active and precharge commands. In other words, how long the memory must wait before the next memory access can begin.
CAS is how long it takes to move from one cell to the next. tRCD is how long it takes to activate a new row. tRAS is how long it takes to actually start reading the memory. Even if tRAS was instantaneous, it would not help much because it still has to wait for at least CAS.
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post #20 of 27
Quote:
Originally Posted by DuckieHo View Post
There's a better explaination out there but I can't find it now. However, I can summarize....


http://www.amd.com/us-en/Processors/...E13335,00.html

CL-tRCD-tRP-tRAS-Command Rate



CAS is how long it takes to move from one cell to the next. tRCD is how long it takes to activate a new row. tRAS is how long it takes to actually start reading the memory. Even if tRAS was instantaneous, it would not help much because it still has to wait for at least CAS.
Yeah, but tRAS pretty much just puts a delay on the RAM access so it SHOULD be slower with it on something high than something low, though benchmarks says otherwise.
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