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Looking for input on E5700 OC

post #1 of 3
Thread Starter 
So I recently picked up an E5700 for a HTPC build I'm working on and I'm trying to squeeze a bit more juice from the CPU, but I'm having a helluva time getting this thing to go over ~250MHz FSB. To determine where my FSB limit was, I tried lowering the multi so CPU speed didn't go over 3.0GHz (stock) and increased FSB... I could get up to ~257MHz before the system would no longer boot, I would need to reset it and I would get the "overclock failed" message upon start up. I've tried tweaking CPU voltage to no avail... please note that the mobo has limited vCore options, Auto, +50mv, +100mv, and +150mv (they all did nothing for me). Also, it seems strange that the system is 100% stable (IBT/p95 tested) until I get to this ~250MHz FSB wall, at which point it will just refuse to boot... I thought I'd run into a range of instability before I got to the flat out won't boot stage, it just seems like such a sudden halt in progression.

For the record, I have this CPU paired with an Asus P5G41T-M LX3 and I'm aware it's not the best OC board out there, but everything I've read says the board usually tops out ~350MHz FSB. On top of that, I took my C2D E6600 from another system and tried it with this board, was able to get up to 333MHz FSB no problem so I'm pretty sure the board isn't the limiting factor here.

I know these CPUs are stock at 200MHz FSB and I know that since it's a 5700 it's probably already near the upper limit of it's performance profile, but I've seen lots of folks get them to run at 300MHz+ FSB. I guess my big question here is, does a CPU's suggested FSB spec have a bearing on how high you can set your system's FSB? I was sort of under the impression that FSB was a limit of the motherboard and that a CPU could handle any FSB as long as the resultant CPU frequency was within its performance range.

One more thing to note... I'm running a fairly old 450W PSU with a 20-pin ATX connector but the mobo has a 24-pin eATX socket. The system runs fine but I'm wondering if it has anything to do with my troubles here.

Anyways, I'm hoping some of you guys might have some takes on this, any bones you can throw my way would be much appreciated smile.gif
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Stupendous
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CPUMotherboardGraphicsRAM
Intel Core i5 2500K ASUS P8Z68-V Galaxy GTX 560 Ti GC Patriot PC3-12800 
Hard DriveHard DriveOptical DriveCooling
Seagate Barracuda 7200.10 250GB Seagate Barracuda 7200.10 500GB Pioneer BDR-207D Cooler Master Hyper 212 Plus 
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ASUS Xonar DG Audio Technica ATH-A700 Sony HT-CT150 
CPUMotherboardGraphicsRAM
Intel Core 2 Duo E6600 EVGA nForce 680i LT SLI PNY GeForce GTX 650 Ti 1GB Patriot PC2-6400 
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post #2 of 3
I've also read that the E5xxx series has a lower FSB ceiling, but it depends on the chip really. I have an E5300 R0 in my Media Center, installed on a Gigabyte EP43-DS3 and I have it running at 3.0 Ghz with a 1200 Mhz FSB (300 x 4), running on the stock voltage 1.2875v. I chose to lower the multi to get this speed and FSB so I didn't have to run the RAM out of spec. I have definitely read that some people have trouble getting to 300 Mhz let alone more.

If your power supply works with the E6600 at 333 Mhz FSB, then it's definitely not the PSU's problem as that chip is made with 65 nm technology and will use more power than the E5700.

Your best bet is to try and run the RAM at it's default speed by doing the same as I did. Aim for a 1200 Mhz FSB (300 x 4) to keep the RAM at DDR2 800 (if that is what you are using), adjust the RAM multiplier, and lower the CPU multiplier as necessary. Also, make sure to keep the RAM voltage at it's default value, along with everything else, including Northbridge. If the board is set to automatically add voltage to the CPU, set it to the default voltage, it should be able to run at the default voltage at up to 3.4 or 3.6 Ghz I guess.

If that doesn't work it might just be that the board does not have the best overclocking compatibility combined with 45 nm E5xxx series (try flashing to the latest BIOS if you haven't already) or you got one of those CPUs that has a lower FSB ceiling.
 
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post #3 of 3
Thread Starter 
Good point re: the PSU, I didn't think of that.

Regarding the memory, I'm using DDR3-1333 with a 1:2 FSB:DRAM ratio so it's running at ~500MHz, definitely under spec so I have a good bit of headroom. Unfortunately though the mobo BIOS doesn't offer much in the way of controls, even after updating to the latest revision... can't explicitly state what speed to run the RAM at, can't set the ratio, can't even set the command rate on the memory timings page (it's permanently set to 1T even if SPD says otherwise).

I haven't played with the NB and VTT voltage settings yet (they're on Auto) and thankfully I can pick explicit values so I'll take your recommendation to try keeping those at default levels and tweak from there. I am getting the sinking feeling though that I probably just have a bunk chip and a mobo that doesn't play nicely with bunk chips. At least this is just a HTPC box and I should be able to get by with stock speeds or a mild OC... one can't help but wonder what could've been though had my chip picking luck been better!

Anyways thank ye for the prompt, quality advice, it's much appreciated thumb.gif
Stupendous
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Spiff
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Tracer
(14 items)
 
CPUMotherboardGraphicsRAM
Intel Core i5 2500K ASUS P8Z68-V Galaxy GTX 560 Ti GC Patriot PC3-12800 
Hard DriveHard DriveOptical DriveCooling
Seagate Barracuda 7200.10 250GB Seagate Barracuda 7200.10 500GB Pioneer BDR-207D Cooler Master Hyper 212 Plus 
OSOSMonitorMonitor
Windows 7 Ultimate x64 Windows XP Professional x86 ASUS PA248Q Toshiba 40FT2U 
KeyboardPowerCaseMouse
Logitech G11 Corsair TX850W Antec Three Hundred Logitech M500 
AudioAudioAudio
ASUS Xonar DG Audio Technica ATH-A700 Sony HT-CT150 
CPUMotherboardGraphicsRAM
Intel Core 2 Duo E6600 EVGA nForce 680i LT SLI PNY GeForce GTX 650 Ti 1GB Patriot PC2-6400 
Hard DriveHard DriveOptical DriveCooling
WD Caviar SATA 250GB WD Caviar PATA 500GB Plextor PX-750A Zalman CNPS9300 AT 
OSOSMonitorKeyboard
Windows 7 Ultimate x64 Windows XP Professional x86 LG 42LG30 Logitech S510 
PowerCaseMouseAudio
Thermaltake PurePower 600 AP Cooler Master Elite 330 Logitech S510 Creative Sound Blaster X-Fi Titanium 
Audio
Panasonic SA-BX500 
CPUMotherboardGraphicsRAM
Intel Pentium E5700 ASUS P5G41T-M LX3 PNY GT 430 1GB PNY PC3-10700 
Hard DriveHard DriveOptical DriveCooling
Maxtor DiamondMax 10 SATA 200GB Maxtor DiamondMax 10 SATA 300GB Lite-On iHAS324 Stock HSF 
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Windows 7 Ultimate x64 Windows XP Professional x86 Panasonic TC-P54S1 Allied 450W 
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Stupendous
(19 items)
 
Spiff
(17 items)
 
Tracer
(14 items)
 
CPUMotherboardGraphicsRAM
Intel Core i5 2500K ASUS P8Z68-V Galaxy GTX 560 Ti GC Patriot PC3-12800 
Hard DriveHard DriveOptical DriveCooling
Seagate Barracuda 7200.10 250GB Seagate Barracuda 7200.10 500GB Pioneer BDR-207D Cooler Master Hyper 212 Plus 
OSOSMonitorMonitor
Windows 7 Ultimate x64 Windows XP Professional x86 ASUS PA248Q Toshiba 40FT2U 
KeyboardPowerCaseMouse
Logitech G11 Corsair TX850W Antec Three Hundred Logitech M500 
AudioAudioAudio
ASUS Xonar DG Audio Technica ATH-A700 Sony HT-CT150 
CPUMotherboardGraphicsRAM
Intel Core 2 Duo E6600 EVGA nForce 680i LT SLI PNY GeForce GTX 650 Ti 1GB Patriot PC2-6400 
Hard DriveHard DriveOptical DriveCooling
WD Caviar SATA 250GB WD Caviar PATA 500GB Plextor PX-750A Zalman CNPS9300 AT 
OSOSMonitorKeyboard
Windows 7 Ultimate x64 Windows XP Professional x86 LG 42LG30 Logitech S510 
PowerCaseMouseAudio
Thermaltake PurePower 600 AP Cooler Master Elite 330 Logitech S510 Creative Sound Blaster X-Fi Titanium 
Audio
Panasonic SA-BX500 
CPUMotherboardGraphicsRAM
Intel Pentium E5700 ASUS P5G41T-M LX3 PNY GT 430 1GB PNY PC3-10700 
Hard DriveHard DriveOptical DriveCooling
Maxtor DiamondMax 10 SATA 200GB Maxtor DiamondMax 10 SATA 300GB Lite-On iHAS324 Stock HSF 
OSOSMonitorPower
Windows 7 Ultimate x64 Windows XP Professional x86 Panasonic TC-P54S1 Allied 450W 
CaseAudio
Silverstone Sugo SG02B-F Denon AVR-1909 
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