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Old 01-23-05, 04:22 PM   #1
Blacklash
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Default Ram Latency and Gaming

Dated and yet interesting article here. It also tends to support the theory that benchmarks are entertaining and useful in some regards yet do not always reflect actual gaming performance.

Tight latency settings show nice gains in actual gaming yet small in benches like 3dmark, particularly for AMD.

"The Halo scores in particular are worth pointing out. Our P4 system gains over 4% going from CAS 3.0 to 2.5, and over 10% going to 2.0. The Athlon 64 does even better, earning 7.5% moving from CAS 3.0 to 2.5 and 13.6% going to 2.0. In both cases, that's an absolutely enormous speed increase, but we were able to verify it with repeated testing. Something about the way Halo is coded makes it highly sensitive to RAM latency, and we wouldn't be surprised if there were other games out there with similar properties."

Source:

http://www.extremetech.com/article2/...1637769,00.asp

So tighten them up people, and yes outside of gaming it is almost inconsequential.
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Old 01-23-05, 04:30 PM   #2
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Default Re: Ram Latency and Gaming

There were a couple of pretty big threads about this a week or two ago, but yeah...besides benchies, lower latencies really have almost no effect on performance at all.
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Old 01-23-05, 05:56 PM   #3
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Default Re: Ram Latency and Gaming

The difference between 1T and 2T though..... HUGE!!! Relax timings and go down to 1T if you can. It's crazy.
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Old 01-23-05, 06:17 PM   #4
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Default Re: Ram Latency and Gaming

What does the 1T/2T mean?
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Old 01-24-05, 08:13 AM   #5
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Default Re: Ram Latency and Gaming

is extremetech.com down? cause I havent been able to get onto that site for days..
Wondering if this is some screwup on my ISPs part, if the site doesnt allow certain countries to connect or something like that..

1T = command per clock enabled..
I think it means that the CPU waits 1 cycle after sending to memory for response, instead of 2 cycles.. not sure tho..
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Old 01-24-05, 10:59 AM   #6
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Default Re: Ram Latency and Gaming

Quote:
Originally Posted by superklye
What does the 1T/2T mean?
It's an Athlon64 thang

It's the number of cycles before issueing a command to the memory.. 1T = 1 cycle / 2T = 2 cycles.

What effects does it have:..

memory bandwidth efficiency.. with 1T you'll get 92~94% of the theoritical bandwidth.. while 2T only delivers 80~85%.. in others words.. 1T command rate makes Athlon64's fly!!
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Old 01-24-05, 02:55 PM   #7
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Default Re: Ram Latency and Gaming

Quote:
Originally Posted by nIghtorius
It's an Athlon64 thang

It's the number of cycles before issueing a command to the memory.. 1T = 1 cycle / 2T = 2 cycles.

What effects does it have:..

memory bandwidth efficiency.. with 1T you'll get 92~94% of the theoritical bandwidth.. while 2T only delivers 80~85%.. in others words.. 1T command rate makes Athlon64's fly!!

It's not just an Athlon 64 "Thang" it affects all systems & cpus.

Lowering the latency can give you huge performance increases.
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Old 01-24-05, 05:22 PM   #8
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Default Re: Ram Latency and Gaming

I only get like 86-85% effenciency (sp?) with mine set to 1t like I have it now in sig. When I clock back to like 236fsb and run cas 2 I get 91%. When I clock cas 2 back up to 240fsb I get back down to 86%. Anybody know what gives? Why does 4mhz make the difference between 91% and 86%?

Does SANDRA have a bug with the K8N Neo2? It shows my RAM as being set at 2.5-3-3-3 not 2.5-3-3-11. It also shows 2-bank interleaving and not 4.
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Old 01-24-05, 06:29 PM   #9
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Default Re: Ram Latency and Gaming

yea.... but if you look at all the other game benchmarks, painkiller didn't even budge, and d3 didn't really gain much at all..

So IMO, I agree with this article's conclusion... If your on a budget, the extra $ can probably spent better elsewhere..

but if your prepared to spend alot of $ anyways on everything, then go right ahead..
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Old 01-24-05, 06:50 PM   #10
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Default Re: Ram Latency and Gaming

mine is set at 2T. According to sandra my bandwith efficency is 71%
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Old 01-24-05, 07:08 PM   #11
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Default Re: Ram Latency and Gaming

Just lowered mine to 1T and it seems to be perfectly stable... we will see though
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Old 01-24-05, 07:28 PM   #12
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Default Re: Ram Latency and Gaming

Just wanted add, yes, 1T for teh win!!
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