Higher tRAS better or worse?

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luniawar20

Honorable
Nov 28, 2013
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10,510
Is higher tRAS better or worse?

So I just upgraded my computer by getting a new ram. I have mix-matched my old & new RAM.

My old RAM:
http://www.newegg.com/Product/Product.aspx?Item=N82E16820231277&Tpk=GSKILL%20F3-12800CL9D-4GBRL

Old Spec:
BZtqsEP.png


New RAM:
http://www.newegg.com/Product/Product.aspx?Item=N82E16820231416

New Spec:
H26wBr0.png



I haven't done stability test yet, but just looking at from CPU-Z, I think I was able to get my performance almost the same except CR and tRAS. From my googling, CR really doesnt affect performance that much, so I guess it is ok to neglect the change. For Cycle Time (tRAS), I got it to be lower and I assume lower number is better?...
 
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HEXiT

Champion
Mar 13, 2011
10,957
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51,965
lower is better but it can only go so low befor it goes out of sync. its also reliant on the other timings. 9-9-9 24 is pretty good as it would normally be around 27+/- 1
if you can the rest of the timings down the timings to 8-8-8 then you may get it down as low as 23.
start with 9-9-8 24 test stability, then 9-8-8 24 then 8-8-8 24 after than start dropping the tras 1 at a time testing each time.
adjusting the tras by itself wont bring much in the way of a performance bump its the cas latency that makes the greatest difference but then again its only gonna bring maybe 1-2% at most.

the way its calculated is CL+tRCD+tRp=tRAS +/-1

this is for overclocking, i certainly wouldn't go to the expense of buying new ram because it has lower tRAS
your old ram is ddr3 1600 the new is ddr3 1600 both cas 9 so there would be no performance gains at all.
because your mixing and matching you want to run the new ram at the old rams tRAS for stability reasons. running it at slower than spec wont have much in the way of an impact on its performance but it will allow the opld ram to run within spec without stressing the memory management unit... if at all possible run both sets at exactly the same timings and i mean all timings (theres about 5 more but dor stability sake always choose the slowest (highest number)ratings between the 2 brands.
 
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