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Stuck @ 3.9Ghz

post #1 of 16
Thread Starter 
I'm Ocing the rig in my signature and after purchasing some new Ram the DDR500 Mushkin Extreme Performance in my specs I can't go past 260Mhz FSB stable. This is on a 3.0 Prescott so I am pretty happy right now but the 4Ghz barrier is looming and I want to break it. I purchased a Zalmann 9500CPSLED and it is keeping things cool but still no luck. I was wondering in my bios thereis a setting to change the ram frequency to 500Mhz I have it set to 400Mhz right now because that was where it was at with the DDR400 I had in it should it be set to the 500Mhz with this new DDR500? I know this is probably a dumb question but I'm not a 100% on t right now.
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post #2 of 16
Whether or not you break the 4.0 GHz barrier, you have an awfully nice OC going.

In your BIOS, you'll want to leave your RAM set to DDR400. That way, it's running 1:1 with your CPU. Since you have DDR500, you won't OC the RAM until you break 250 MHz, so you'll get good bandwidth and nice timings. If you set it to DDR500, your system would be running 4:5, and you would likely have to tweak your RAM settings as your current OC would require your RAM to run at 325 MHz. While that is certainly conceivable, there won't likely be a corresponding performance increase. At the very least, it won't help a bit with your CPU.

For that CPU, what is your current load temp and vcore? You're up far enough you may want to consider bumping the chipset voltage one notch. That sometimes can help, but pay close attention to temperatures if you do so as that mobo has only passive cooling on the Northbridge.
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post #3 of 16
Thread Starter 
I'm at 1.475 on the vcore and I read on a thread just a little over 1.5 I should stop. The increased voltage did not seem to help wit the OC I upped the ram voltage a little and that helped some. Right now with the Zalmann I just installed load is around 55C so I think I am still okay on that. I was wondering if my power supply is holding me back it is only a 300watt but it is an Antec. I have not replaced it yet since until now I thought the ram was limiting me but I'm still unsure what is holding me back or have I just reached the highest OC. I bought the DDR500 but now it is running DDR520 so It is running stable at over its rated speed and it still might be limiting me right now I can't figure out what the bottleneck is. I have no idea how to figure out what is holding me back besides opting for a better power supply and see what happens. Anybody else have a similar issue or have any idea what is the next logical step. The temps seem good and I have good Memory I can only guess replace power supply and see if I can get more.
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Intel I5 760 2.8GHZ EVGA P55 LSI 132-LF-E655 Gigabyte GTX 460 Mushkin 2x2gb DDR3 2000 
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74GB Raptors (Raid 0) Samsung CD/DVD SH-S223C Windows 7 professional Samsung 2253BW 22" 
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My System
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CPUMotherboardGraphicsRAM
Intel I5 760 2.8GHZ EVGA P55 LSI 132-LF-E655 Gigabyte GTX 460 Mushkin 2x2gb DDR3 2000 
Hard DriveOptical DriveOSMonitor
74GB Raptors (Raid 0) Samsung CD/DVD SH-S223C Windows 7 professional Samsung 2253BW 22" 
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post #4 of 16
For a Prescott, the key items are 65°C load temperature and 1.525 volts vcore. You can afford to take the vcore a wee bit higher as long as the temps are still good.

It is possible that your PSU is the issue. How many amps do you have on the 12 volt rail? You can find that on a sticker on the PSU or on the manufacturer's site for your particular model. Very roughly, a Prescott burns around 100 Watts before overclocking, so that's using a lot of power. The other big power drain is a GPU running 3D calculations. Everything else is much smaller by comparison.

One thing to consider is that you may have reached your CPU's maximum. A 30% overclock is very good, particularly on air cooling. Your CPU may just not be able to go any faster. That, of course, doesn't mean you shouldn't try.
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post #5 of 16
Thread Starter 
On Antecs site they say 15a on the 12v ....Is that enough? I just went and bought another PSU Antec 480watt is has dual 12v but they are 18a not a big increase. I saw another that had the 12v listed @ 28a...should I go for that?
My System
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CPUMotherboardGraphicsRAM
Intel I5 760 2.8GHZ EVGA P55 LSI 132-LF-E655 Gigabyte GTX 460 Mushkin 2x2gb DDR3 2000 
Hard DriveOptical DriveOSMonitor
74GB Raptors (Raid 0) Samsung CD/DVD SH-S223C Windows 7 professional Samsung 2253BW 22" 
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Z Board Thermaltake Black Widow 850 watt Antec P180 IHome 
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My System
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CPUMotherboardGraphicsRAM
Intel I5 760 2.8GHZ EVGA P55 LSI 132-LF-E655 Gigabyte GTX 460 Mushkin 2x2gb DDR3 2000 
Hard DriveOptical DriveOSMonitor
74GB Raptors (Raid 0) Samsung CD/DVD SH-S223C Windows 7 professional Samsung 2253BW 22" 
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post #6 of 16
Quote:
Originally Posted by ricbrooks2
On Antecs site they say 15a on the 12v ....Is that enough? I just went and bought another PSU Antec 480watt is has dual 12v but they are 18a not a big increase. I saw another that had the 12v listed @ 28a...should I go for that?
uh, that antec has dual rails of 18A each, making for 18+18=36A on your 12v rail. I would get that Antec, there strong and reliable PSU's. 36A is definitly sufficient, now you can scrach of the PSU issue for the future.
    
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post #7 of 16
Thread Starter 
Does that mean I have 36a even if both aren't pugged into the board? I know that sounds stupid but I don't know. My mobo only has a connection for one beneath the processor.
My System
(13 items)
 
  
CPUMotherboardGraphicsRAM
Intel I5 760 2.8GHZ EVGA P55 LSI 132-LF-E655 Gigabyte GTX 460 Mushkin 2x2gb DDR3 2000 
Hard DriveOptical DriveOSMonitor
74GB Raptors (Raid 0) Samsung CD/DVD SH-S223C Windows 7 professional Samsung 2253BW 22" 
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Z Board Thermaltake Black Widow 850 watt Antec P180 IHome 
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My System
(13 items)
 
  
CPUMotherboardGraphicsRAM
Intel I5 760 2.8GHZ EVGA P55 LSI 132-LF-E655 Gigabyte GTX 460 Mushkin 2x2gb DDR3 2000 
Hard DriveOptical DriveOSMonitor
74GB Raptors (Raid 0) Samsung CD/DVD SH-S223C Windows 7 professional Samsung 2253BW 22" 
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Z Board Thermaltake Black Widow 850 watt Antec P180 IHome 
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post #8 of 16
Quote:
Originally Posted by ricbrooks2
Does that mean I have 36a even if both aren't pugged into the board? I know that sounds stupid but I don't know. My mobo only has a connection for one beneath the processor.
Yep you will get the full 36A, dont worry about stupid questions, Im shure we have all asked a few before...

Also how were you planing to use the PSU? Are you going to combine the PSU's to make for 1 good one, or are you just going to use 1? Because that 1 Antec 480w 36A PSU is pleanty of power for your specs.
    
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post #9 of 16
Thread Starter 
I'm just going to switch out the PSU's and see if that was the problem holding me back from 4.0Ghz. Going to have a go at it tonight. Thank you wowza for answering my questions about the PSU now I feel better about my purchase. Bought from Compusa they had a deal on it $89 with a $30 rebate for the PSU that even beats Newegg which usually doesn't happen.
My System
(13 items)
 
  
CPUMotherboardGraphicsRAM
Intel I5 760 2.8GHZ EVGA P55 LSI 132-LF-E655 Gigabyte GTX 460 Mushkin 2x2gb DDR3 2000 
Hard DriveOptical DriveOSMonitor
74GB Raptors (Raid 0) Samsung CD/DVD SH-S223C Windows 7 professional Samsung 2253BW 22" 
KeyboardPowerCaseMouse
Z Board Thermaltake Black Widow 850 watt Antec P180 IHome 
  hide details  
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My System
(13 items)
 
  
CPUMotherboardGraphicsRAM
Intel I5 760 2.8GHZ EVGA P55 LSI 132-LF-E655 Gigabyte GTX 460 Mushkin 2x2gb DDR3 2000 
Hard DriveOptical DriveOSMonitor
74GB Raptors (Raid 0) Samsung CD/DVD SH-S223C Windows 7 professional Samsung 2253BW 22" 
KeyboardPowerCaseMouse
Z Board Thermaltake Black Widow 850 watt Antec P180 IHome 
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post #10 of 16
Quote:
Originally Posted by ricbrooks2
I'm just going to switch out the PSU's and see if that was the problem holding me back from 4.0Ghz. Going to have a go at it tonight. Thank you wowza for answering my questions about the PSU now I feel better about my purchase. Bought from Compusa they had a deal on it $89 with a $30 rebate for the PSU that even beats Newegg which usually doesn't happen.
wow, thats a great deal, heck i see those PSU's at Fry's for over 110bux.. Good luck at 4GHz, 3.9GHz is sweet in itself, i mean, most people usually max out at 3.75GHz...
    
CPUMotherboardGraphicsRAM
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Hard DriveOptical DriveOSMonitor
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GE Keyboard 9 Cell Battery E1705 Frame Razer Diamondback 
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Icemat 
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CPUMotherboardGraphicsRAM
T2500 Core Duo Dell Laptop Quadro 1500m flashed--> 7900GTX 2x1GB G.Skill DDR2-800 
Hard DriveOptical DriveOSMonitor
200GB SATA 5400RPM 8x DVD±RW Burner XP Home SP2 17" LCD (1920x1200) + 20.1" Samsung Widescreen 
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