Overclock.net › Forums › Components › Memory › does rasing voltage help lower cas# latency ???
New Posts  All Forums:Forum Nav:

does rasing voltage help lower cas# latency ??? - Page 2

post #11 of 16
Thread Starter 
@kevinf. yeah that's correct, but in the read up i'd don't acctually tell you what prevents you from going even lower than 6 or 7. simply is it more voltage = lower/tighter timings or am i missing something ? i want the minimum speed to be 1333 and more like 1600 anything inbetween is good with help from FSB. i'v only been working with timings for a few weeks, i'v allways overclocked cpu/ram but never understood timings till now. i'v donw alot of reading and research so i understand what each of the timmings does i just don't understand what is stopping me going lower other than voltage, sorry for sounding stupid but you's are helping quite alot thanks ! so does anyone know what stops lower timings ??
    
CPUMotherboardGraphicsRAM
phenom ii 925 Gigabyte GA-770T-USB3 7950gt (OC) 2gb corsair ddr3 1333 VS2GB1333D3 
Hard DriveOptical DriveOSMonitor
500gb seagate 7200, 1tb WD green 5400 benq dl-dvd-rw win 7 ulti x64 benq 21'' 1680x1050@60hz 
KeyboardPowerCaseMouse
logitech k260 thermaltake 500w antec logitech m210 
  hide details  
Reply
    
CPUMotherboardGraphicsRAM
phenom ii 925 Gigabyte GA-770T-USB3 7950gt (OC) 2gb corsair ddr3 1333 VS2GB1333D3 
Hard DriveOptical DriveOSMonitor
500gb seagate 7200, 1tb WD green 5400 benq dl-dvd-rw win 7 ulti x64 benq 21'' 1680x1050@60hz 
KeyboardPowerCaseMouse
logitech k260 thermaltake 500w antec logitech m210 
  hide details  
Reply
post #12 of 16
Your best bet is to try Everest memory benchmark to test for Latency. Eg: for me 1600CL7 vs 1800CL8 , did the increase in speed make up for the increase in CAS? Of course i also got other bandwidth increases going from 1600 to 1800. Now the software is called Aida64 btw.

see http://www.legitreviews.com/article/750/5/ the first and last pictures.
OC'in beast
(20 items)
 
  
CPUMotherboardGraphicsGraphics
AMD FX-8350 (Vishera) Gigabyte GA-990XA AMD 285X (unreleased) AMD 285X (unreleased) 
RAMHard DriveHard DriveOptical Drive
Mushkin Enhanced Blackline 8GB (996679) Western Digital WD10EALS 1TB Blue Corsair Force Series GT CSSD-F180GBGT-BK 180GB Sony 20X Sata DVD-RW 
CoolingCoolingCoolingCooling
Scythe Mugen 2 rev B (3) Scythe Slip Stream SY1225SL12H-P Antec Tri-Cool 140mm Antec Tri-Cool 120mm 
CoolingOSMonitorKeyboard
Scythe Ultra Kaze DFS123812-3000 Windows 7 Pro 64bit ASUS PA248Q 24.1" IPS Coolermaster Storm QuickFire Stealth Cherry MX ... 
PowerCaseMouseMouse Pad
Antec Earthwatts EA-750 Antec 300 Logitech G5 Steel Series Starcraft 2 Marine 
  hide details  
Reply
OC'in beast
(20 items)
 
  
CPUMotherboardGraphicsGraphics
AMD FX-8350 (Vishera) Gigabyte GA-990XA AMD 285X (unreleased) AMD 285X (unreleased) 
RAMHard DriveHard DriveOptical Drive
Mushkin Enhanced Blackline 8GB (996679) Western Digital WD10EALS 1TB Blue Corsair Force Series GT CSSD-F180GBGT-BK 180GB Sony 20X Sata DVD-RW 
CoolingCoolingCoolingCooling
Scythe Mugen 2 rev B (3) Scythe Slip Stream SY1225SL12H-P Antec Tri-Cool 140mm Antec Tri-Cool 120mm 
CoolingOSMonitorKeyboard
Scythe Ultra Kaze DFS123812-3000 Windows 7 Pro 64bit ASUS PA248Q 24.1" IPS Coolermaster Storm QuickFire Stealth Cherry MX ... 
PowerCaseMouseMouse Pad
Antec Earthwatts EA-750 Antec 300 Logitech G5 Steel Series Starcraft 2 Marine 
  hide details  
Reply
post #13 of 16
Quote:
Originally Posted by kevinf;14668016 

@Impunity, 6 or 7 @ 1600 is normally reserved for high end kits. 8 for midrange, 9 for lower end. Whats the brand/model of the ram? If it started out as a low end kit, you could probably expect it to tighten to CL9 easy, if its decent corsair/gskill/mushkin you could get even lower.

CAS latency is pretty much the minimum amount of time to access a random memory address and have its data available. Although im not 100% why, its always been the faster you push your ram, the harder it is to maintain the low latency. http://en.wikipedia.org/wiki/CAS_latency for more reading.

specifically:
--
In general, the lower the CAS latency, the better. Because modern DRAM modules' CAS latencies are specified in clock ticks instead of time, when comparing latencies at different clock speeds, latencies must be translated into actual times to make a fair comparison; a higher numerical CAS latency may still be a shorter real-time latency if the clock is faster. However, it is important to note that the manufacturer-specified CAS latency typically assumes the specified clock rate, so underclocking a memory module may also allow for a lower CAS latency to be set.
--
the RAM i got is G.Skill. i understand the fundamentals, i'm just not sure what is the limiting factor in dropping CL times? i know in theory you could endup bottlenecking the proccessor, but aside from that whats going on that "high quality" RAM can be timed tighter?
    
CPUMotherboardGraphicsRAM
I think it's a vacuum tube Silicone, mostly Provided by Jackson Pollack 640k 
Hard DriveMonitorPowerCase
Stone tablets In Technicolor An old transformer in a puddle Milk crate 
Mouse Pad
Seriously, there's a mouse pad slot? 
  hide details  
Reply
    
CPUMotherboardGraphicsRAM
I think it's a vacuum tube Silicone, mostly Provided by Jackson Pollack 640k 
Hard DriveMonitorPowerCase
Stone tablets In Technicolor An old transformer in a puddle Milk crate 
Mouse Pad
Seriously, there's a mouse pad slot? 
  hide details  
Reply
post #14 of 16
CAS # is more tied to the NB than RAM, from my experience .. dont mistake what im saying though.. if your RAM will not run 'x'-CAS# ..then it will not.. regardless of setting or voltage in most cases.

*ie-

if you have RAM you have verified DOES run at various cas#'s .. but you just cannot get it to cooperate at that timing in said rig - this is indication of NB voltage issue..the IMC/NB needs a certain amount of voltage to produce a certain level of latency..much more so than the RAM.
post #15 of 16
Thread Starter 
Thanks again everyone, i'm going to give it all another go from scratch but start with NB frequecy at 250 FSB at 250 so the link between them is faster and benchmark with my other results, also i'm going to strap a huge heatsink to either side of the ram using arctic silver HTP with a fan each side push pull and try 2.0v and maybe try cas 5-6 ! please let me know if this in NOT recomended other than frying ram ? ram i don't care much about anyway getting new stuff soon.

i allready have everest and my latency is 51.6 ns
Edited by brumby 1990 - 8/22/11 at 7:18pm
    
CPUMotherboardGraphicsRAM
phenom ii 925 Gigabyte GA-770T-USB3 7950gt (OC) 2gb corsair ddr3 1333 VS2GB1333D3 
Hard DriveOptical DriveOSMonitor
500gb seagate 7200, 1tb WD green 5400 benq dl-dvd-rw win 7 ulti x64 benq 21'' 1680x1050@60hz 
KeyboardPowerCaseMouse
logitech k260 thermaltake 500w antec logitech m210 
  hide details  
Reply
    
CPUMotherboardGraphicsRAM
phenom ii 925 Gigabyte GA-770T-USB3 7950gt (OC) 2gb corsair ddr3 1333 VS2GB1333D3 
Hard DriveOptical DriveOSMonitor
500gb seagate 7200, 1tb WD green 5400 benq dl-dvd-rw win 7 ulti x64 benq 21'' 1680x1050@60hz 
KeyboardPowerCaseMouse
logitech k260 thermaltake 500w antec logitech m210 
  hide details  
Reply
post #16 of 16
Quote:
Originally Posted by xd_1771;14643118 
Raising the voltage will allow for more latency & speed headroom.
From a generic 1333 CL9 kit, don't expect much though

This...
Red Dragon
(16 items)
 
  
CPUMotherboardGraphicsRAM
Amd Phenom II X4 960T @ 4.2Ghz @ 1.475v Asus Sabertooth 990FX @ NB 3.2Ghz @ 1.35v Sapphire ATI 5870 Vapor-X Corsair Dom 4GB DDR3 1600MHz 7-7-7-21-1t @ 1.65v 
Hard DriveCoolingOSMonitor
Samsung F3 (1+1)Tb Venomous-X + Scythe GT Window 7 Ultimate 32bit Samsung P2770H 27' 
KeyboardPowerCaseMouse
Razer Tarantula Corsair TX650W HAF 922 Logitech G9X  
Mouse PadAudioAudio
Razer Goliathus Altec Lansing VS4621 Roccat Kave 
  hide details  
Reply
Red Dragon
(16 items)
 
  
CPUMotherboardGraphicsRAM
Amd Phenom II X4 960T @ 4.2Ghz @ 1.475v Asus Sabertooth 990FX @ NB 3.2Ghz @ 1.35v Sapphire ATI 5870 Vapor-X Corsair Dom 4GB DDR3 1600MHz 7-7-7-21-1t @ 1.65v 
Hard DriveCoolingOSMonitor
Samsung F3 (1+1)Tb Venomous-X + Scythe GT Window 7 Ultimate 32bit Samsung P2770H 27' 
KeyboardPowerCaseMouse
Razer Tarantula Corsair TX650W HAF 922 Logitech G9X  
Mouse PadAudioAudio
Razer Goliathus Altec Lansing VS4621 Roccat Kave 
  hide details  
Reply
New Posts  All Forums:Forum Nav:
  Return Home
  Back to Forum: Memory
Overclock.net › Forums › Components › Memory › does rasing voltage help lower cas# latency ???