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Technically, CL2 and CL1.5 might be the same for the current A64 platform.
But at least when you're playing with a DFI nF4 Ultra-D, (SLI-D, DR)
as some people have already experienced, somehow CL1.5 seems to be slower,
and more stable than CL2 on same speeds.
Conclusion, CL1.5 with nF4 series and A64 is nonsense. :)
AMD Athlon 64 3000+ @ 2.2GHz, Newcastle Core, Socket 754, 1.55vCore
DFI LanParty UT nForce 3 250Gb, BIOS 9/14 BETA
1GB (2x512MB D/C Kit) GeIL Golden Dragon PC3200 (Samsung Chips)
RAM @ 220MHz (DDR440), 2.9v, 1.5-3-2-5. perfectly 100% stable.
http://www.tomshardware.com/motherbo...1/geil-08.html
Does AMD Even Support CL 1.5?
Naturally, we also took this question to AMD, to ask them if the memory controller for the Athlon 64 could itself handle a CAS Latency setting of 1.5 clocks. The answer to the question was curt, and referenced a technical document on the AMD-Website that sheds no light of any kind on the subject of supported memory timings. Our interpretation of this response includes the observation that AMD didn't provide any reaction to the topic of supported CAS latency timings. Thus, we cautiously take their admittedly opaque response as a "yes."
Summary And Conclusions: Spare Yourself Of CL 1.5
The only real consequence of using the GeIL DIMMs at CL1.5 timings is the need to boost input voltage to at least 2.9V. Beyond that, this faster mode of operation works inconspicuously. So inconspicuously, in fact, that we had to double-check to make sure our configuration really included the correct timing parameter. Nor could we really prove to our own satisfaction that this parameter was in effect, and thus had to rely on the setting shown in the BIOS and verified by CPU-Z. That's why we suspect that the Athlon 64 barely supports this short CAS latency setting, nor appears to be able to make any effective use of it, either.
Oh well. For me, it's not hurting anything, and I don't need to increase the voltage to get CAS 1.5. @ 200MHz (DDR400) I can run 2.8v, 1.5-3-2-5. 220MHz, 1.5-3-2-5, I need 2.9v. My RAM is warranted to 2.95v anyway--so no biggie.
:D I also need no increase of Vdimm for CAS 1.5 - but who cares if it doesen't perform better than CAS 2 at all........... :rolleyes:
:toast:
People are talking about how there stuff is more stable at 1.5 then 2.0, how can it be the same? Same reason a whole bunch of other wierd random bios settings will make things more stable. It's the same 20ns latency just a different bios setting so that is where you get your different results.
-CaT
hi
i just got the df sli and the ocz vx 4000
i am doing 1,5-2-2-5 at 3,4v
here
the increase of the bandwidth tests is minimal
and i need the same volts that with cl2
its a bit slower in superpi
gives nice pics...and when u sell your stuff u show the pics....lol they love it
:D Hehe - now we finally found a reason for CAS 1.5 - better price to get when selling it to noobs......... :slapass:Quote:
Originally Posted by steelballzz
:toast:
My BH-5 memory sees a stability gain from the CAS 1.5 BIOS setting.
The timing may not accomplish anything for performance, but when it gains me another ~5 MHz (I am sitting at 278 MHz with memtest86 stability), I see it as worthwhile.
Clearly, Oskar has done something for this setting, "CAS 1.5" definitely changes something.
ya but i dont think its a just a DFI thing that "it does something" i got some cheep kingston kvr with infineon ce-5 chips while waiting for my OCZ BH5 and i was just playing with setting it up a bit. With 2-3-2-8 i can run prime for couple hours but with 1.5-3-2-8 i stoped prime at 12 hours, thats on my socket 754 epox, so the thing with 1.5 is deffenetly something up with the CPU mem controler
:D Right - but no suppert by AMD yet. But who knows - maybe further developed mem controllers will in future...... ;)Quote:
Originally Posted by Millyons
:toast:
There will be no ddr in the future :stick:Quote:
Originally Posted by HARDCORECLOCKER
No DDR1....maybe we'll be having this discussion in the future, only then the issue at had would be DDR2 @ CL2.5 :p:Quote:
Originally Posted by dippyskoodlez
:D Right Stephen - but worst scenario: We'll have to discuss whether DDR3 is running CAS 3 or 4.......... ;)Quote:
Originally Posted by s7e9h3n
:toast:
All I know is that the Cas 1.5 setting is faster for benching and did give lower latency times in everest.
But for real world stuff (like giving up all my sleep to play GTA: SA) it makes no diffrerence.