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Old 01-28-2014, 03:32 PM   #1
ejluvsrush
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Question Best AMD speed?

Greetings and salutations!

Looking for some opinions please.

I have 8 gigs of Corsair Vengeance 1600 version 8.16 and an AMD FX6300 Black Edition processor. I have the processor clocked to 4.52 ghz and can overclock the memory stable at 1833 but have seen in the forums that some users don't clock beyond 1600 with AMD processors.

Why not? Is there a specific reason or advantage? Is there a reason NOT to go beyond 1600? And what about trying to push beyond 1833?

I don't game on my computer. Lots of music, downloading, streaming, photo editing and video compilation/editing.

Thanks!

EJ
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Old 01-28-2014, 04:51 PM   #2
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Tip: Clock for maximum bandwidth. Test, test, test.

Speed usually goes hand in hand with looser timings, which might not necessarily be the better situation, especially on AMD's.
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Old 01-28-2014, 04:56 PM   #3
chartiet
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depends, Phenom II's were golden at 1600, fx chips seem to be better off at 1866 but i havnt seen many mem above that

From FX Performance Tuning Guide:
"Note that CPU NB clock should be 2x Memory clock or higher (e.g. DDR3-2400 (1200MHz) would require at least 2400MHz CPU NB clock). CPU NB Multiplier is unlocked on all of the AMD FX-series CPUs."

I do not know why we dont see more 2133 and 2400 with AMD FX's.
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Old 01-28-2014, 05:04 PM   #4
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Quote:
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depends, Phenom II's were golden at 1600, fx chips seem to be better off at 1866 but i havnt seen many mem above that

From FX Performance Tuning Guide:
"Note that CPU NB clock should be 2x Memory clock or higher (e.g. DDR3-2400 (1200MHz) would require at least 2400MHz CPU NB clock). CPU NB Multiplier is unlocked on all of the AMD FX-series CPUs."

I do not know why we dont see more 2133 and 2400 with AMD FX's.
Because AMD is not Intel. The IMC is not as good. AMD's still prefer tighter timings and lower ram speed to this day.
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Old 01-28-2014, 05:14 PM   #5
chartiet
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Because AMD is not Intel. The IMC is not as good. AMD's still prefer tighter timings and lower ram speed to this day.
and bingo was his name o'...
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Old 01-28-2014, 05:32 PM   #6
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My timings are at 9 - 11 - 9 - 27 and 1. Stock timings I believe are 9 - 10 - 9 - 24.

Am I better off with 1600 at stock?

And while AMD may not be intel for sure, I have always preferred and loved them and believed them to be superior

EDIT...I have adjusted voltage on the memory to 6.50 but have not touched the NB.
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Old 01-28-2014, 06:45 PM   #7
chartiet
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6.5v? Are u sure?
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Old 01-28-2014, 08:15 PM   #8
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Sorry about that. I meant 1.65

Doh!
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Old 01-28-2014, 08:39 PM   #9
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I'm running near 2133 right now on my rig. It seems more stable than if I ran it at 1600, however the ram's rated for that anyways.

I don't think newer AMD's really will have a hard time hitting the higher FSB's (Like some older ones) however they may not be as stable or fast.

If your ram's rated for 1600 I wouldn't go too much farther than that. Push it if you can, but I really don't see any advatages of faster speeds and looser timings.

I had no problems at higher fsb's. Running my HT link at 2347mhz with no problem for now; everything seems pretty stable as it can be. I did bump up my NB and Ram volts a bit (1.65 on the ram; IDK what on the NB, it's pretty much just a few notches from maxed).

Heat's my main issue. These chipsets and CPU's get hot, but I'll get a WC loop sometime when I'm working again.
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Old 01-29-2014, 07:51 AM   #10
chartiet
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A rule of thumb;

Equation:
Lat (ns) = 2000*(CL/freq)
Cycle (ns) = 1000/(freq/2)
Bit (ns) = 1000/freq
1 Word (ns) = Cycle * CL
8 Words (ns) = 1 Word + (7*Bit)
Average = 1 Word/8 Words

The lowest average wins. As you can see from the table attached, it all depends…
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File Type: pdf ram formula.pdf (30.0 KB, 71 views)
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Old 01-29-2014, 09:35 AM   #11
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Thank you all for your replies, I very much appreciate it! I'll probably just go stock, but this little bug in my ear is like "this ram is MADE to be over clocked!"

I will try to ignore it along with all the other voices in my head.
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