about memory latency and bandwith

[dmelsie]

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which is faster a memory with higher latency or higher bandwith?
nalibog man gud ko ani nila

[poldopunk]

if you can get to balance both, it would be better.

memory latency is the amount of time your memory responds to data while memory bandwidth is the transfer. DDR2 RAMs beyond DDR2-400 have high latencies but better memory bandwidths, this is why enthusiasts tighten the RAM settings after overclocking the RAM to compensate for its latency (i hope its the right term).

in other words, the higher DDR2-RAM is, its latency would also start to $uck, again, the reason why an enthusiast tighten the RAM settings para paspas gihapon bisan taas na ug frequency.

[dmelsie]

@poldo thanx for the holy enlightenment hehehe
ok i will try to balance my mem timings and speed
one thing ask lang ko so asa may mas maayo
buying a memory with 4-4-4-12 timings na or 5-5-5-18 then e modify lang ang iya timings lower?
is it possible pa ba nga ubsan ang 4-4-4-12 timings then running at 800? or dili na?
need some inputs ani thanx

[bootbox]

if you tighten your timings
raise ram voltage also

make sure your ram can take the increased voltage

[simoko]

if you tighten your timings
raise ram voltage also

make sure your ram can take the increased voltage

be extra careful when u raise your ram voltages...this is where u separate the men from the boys so to speak...example: most OCZ/Mushkin rams have their tightest timings when operating at 2.1V or 2.2V...the garden variety rams usually fry at these voltages...

[poldopunk]

@poldo thanx for the holy enlightenment hehehe
ok i will try to balance my mem timings and speed
one thing ask lang ko so asa may mas maayo
buying a memory with 4-4-4-12 timings na or 5-5-5-18 then e modify lang ang iya timings lower?
is it possible pa ba nga ubsan ang 4-4-4-12 timings then running at 800? or dili na?
need some inputs ani thanx

it depends on how heavy you'd be overclocking the RAM kung ubos na kaayo ang timings at 800, k raman. but since 800 is really operating at 400 MHz then in my opinion, once you go past 400 MHz Front Side Bus, you are now overclocking the RAM as well if you maintain 1:1 ratio. Chances are, unstable na imong system at this point since mosaka naman imong RAM where it has a low latency na.

Read the posts by simoko, i don't overclock the RAMs and much more touch the voltage settings of these fragile little things . My principle is kung pila ang speed sa akong RAM, mao akong maximum FSB .

**EDIT**

just play with your timings according to your fsb overclock kay kung masipyat ka, di raman na mo post -- reset CMOS lang BUT it is with ram voltage tweaking that you should be careful about because if you want to get tighter timings, memory voltage has to go up.

[dmelsie]

dili pa ko mo increase sa voltage sa memory unya nag hapit na ko mag ilis
another thing maka affect ba if asa nimo gibutang ang ram?
like populating the 1st socket then the partner ofr dual channel? or if 2nd slot then iya partner
wala ba diference na?
thanx sa mga inputs

[simoko]

dili pa ko mo increase sa voltage sa memory unya nag hapit na ko mag ilis
another thing maka affect ba if asa nimo gibutang ang ram?
like populating the 1st socket then the partner ofr dual channel? or if 2nd slot then iya partner
wala ba diference na?
thanx sa mga inputs

dili ra mo affect sa latency/bandwidth kung asa nga slot nimo ibutang(basta maka dual channel lang ka as u said)...but...there are motherboards nga magka problema if u populate all memory slots...design issue ni that affects the voltage refresh for the slots(3,4)...this is where u see intermittent lockups(kaging) bisan wala pai system activity...

[simoko]

OT: if u are not comfortable raising the ram and northbridge voltages during overclocking, THEN DON'T....the worst is u will end up with a fried mobo/proc/ram and the best would be a system that will not post...reset cmos lang payts na balik...

[poldopunk]

If you're not confident enough about overclocking your RAM then consider using Memory Divider(s) or otherwise known as FSBRAM ratio. You might want to check your BIOS if it has this option, it may not look exactly like 1:1, 3:4, 4:5, 6:10 but it'll come up as a Memory Multiplier in your BIOS or even Auto.

Now if it has this option, use the appropriate memory divider for your motherboard choosing the one that will not overclock your RAM but still mo-compensate gihapon sa imong overclocked CPU FSB.

If you're not familiar with what memory divider is, then ask here and I'll explain it as simple as I can from reading online resources about this one since medyo vague ilang explanation giving you formulas or the direct output instead.