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Mem - same speed, diff timings, diff banks

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January 25, 2011 1:31:51 PM

Didn't see this exact question from scanning the forum, sorry if it's a repeat.

I have an existing PC, Intel i5 750, Asrock p55 extreme MB. 4GB RAM (2x2GB) of these: http://www.newegg.com/Product/Product.aspx?Item=N82E168... G-skill, DDR3 1600 (PC3 12800) 7-8-7-24

I could buy 2 more, they aren't super expensive and newegg is having a sale. But I was browsing their sale items and saw this: http://www.newegg.com/Product/Product.aspx?Item=N82E168... A-data gaming series, DDR3 1600 (PC3 12800), 9-9-9-24. About $20 cheaper.

is the difference in timing, being in separate banks, likely to cause any problems? Thoughts or suggestions?
January 25, 2011 4:49:00 PM

Ooh, this is going to be fun! Someone page Malmental and sminlal and we can have a foodfight.

But seriously. There are two main camps of thought on this, and people in both camps have hard, documented experience showing that they are right. Some of us, myself included, will mix and match. The whole aggregation of memory works at the worst of every setting: highest latency, lowest speed, highest voltage.

The other group has experienced horror stories mixing memory from different vendors, and even different models from the same vendor.

So you pays your money and takes your chances. You get a little more certainly with a matched set of 4.
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a c 347 } Memory
January 25, 2011 5:18:55 PM

1600 7-8-7-24-2T @ 1.65v
1600 9-9-9-24-?T @ 1.55v - 1.75v
=========================
1600 9-9-9-24-2T @ 1.65v and PRAY it works!


1600 7-8-7-24-2T @ 1.65v
1600 7-8-7-24-2T @ 1.65v
===================
1600 7-8-7-24-2T @ 1.65v and KNOW it works!

Generally, I never mix CAS or RAM Mfg's or Speed or IC's if I can help it. Therefore, Kiss $20 bye and save yourself $100+ in aggravation. ;) 

PRAY vs KNOW - $20 is worth the KNOWING.
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January 25, 2011 6:15:15 PM

Hey - I'm cheap :) 

Just speculating:

1600 7-8-7-24-2T @ 1.65v
1600 9-9-9-24-?T @ 1.55v - 1.75v
=========================
1600 7 8 7 24 2T 1.65v via overclocking? I mean, if the 99924 would OC to 78724 anyways.... (I mean, it's not changing the clock, but it's manually setting attributes to non-factory)?

I can certainly go with the matched memory, I'm just trying to figure out what is possible.
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a c 347 } Memory
January 25, 2011 7:07:56 PM

^You're going to be 9/10 throwing in a lot of errors {1600 7 8 7 24 2T 1.65v}, and IF there's a gain it will be negligible at best. Save $20 somewhere else and not on your Swiss Atomic Clock billionths of a second sorting machine {RAM / CAS 7 = 7/1,000,000,000 / second}.

It's your rig so it will be your problems to contend with, and it's nothing that I would recommend to anyone.

Keep in mind, a Quality IC has a tight CAS, a 9-9-9-24 can often be faster than a 7-8-7-24. This is a deceptive CAS shell game.

Example:
Comparison Module #1: Mushkin Redline 996805 6-8-6-24 1600MHz
Comparison Module #2: G.Skill Pi Series 7-8-7-24 1600MHz
Comparison Module #3: Mushkin 998687 8-9-8-24 1866MHz
Comparison Module #4: Corsair Dominator TR3X6G1600C8D 8-8-8-24 1600MHz
Comparison Module #5: Kingston HyperX T1 9-9-9-27 1600MHz
Comparison Module #6: Mushkin Blackline 998677B 7-7-7-20 1333MHz
Comparison Module #7: Patriot Viper II Sector 7 9-9-9-27 1800MHz
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