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OC results so far with Opteron 148 and G.Skill PC4000 Dual....

post #1 of 37
Thread Starter 
Hi All -
I'm a Newbie to this forum. I just bought some new hardware and ran across this forum and decided to post my results thus far with the new Opt 148 Venus and PC4000 G. Skill Dual 2 x 1gb.
I can get my FSB up to 325 at stock nf4 chipset voltage with the memory and CPU being turned down. So I know the motherboard is good for some serious OC'ing.
Last nite I tried to see how far the new G.Skill memory PC4000 would go if I turned down the CPU to like 8x mult. Using a FSB of 290 and vdimm of 2.65v, I was able to crank the memory up to 580ddr and still boot into windows. I didn't run Memtest on it though but the memory seems to be awesome for overclocking. I could have went farther but I figured that the DDR580 was good enough for me as a ceiling as I'll never probably need it even that high. Stock voltage is spec'ed as 2.6v and max is 2.8 according to manufacturer.

Now the bad news, I can't even get my CPU to be stable at 2.75ghz. I tried various settings last nite and ran Prime and most everything failed in prime immediately if over 2.8. I ran it overnite with a 2750 speed as you suggested @ 1.45vcore and had good hopes but this morning I checked and it failed after 1 1/2 hours. Settings for this were:
250FSB
4X HT mult
11X CPU mult
1.45vcore
1.6vdimm @ 3-4-4-8 1T stock on the PC4000 GSkill

Before I left for work, I upped the vcore even more to about 1.495 which I'm not too comfortable with, and also the vdimm to 2.65v from 2.6v and chipset nf4 to 1.6v from 1.5v. We'll see later.

One weird thing to mention, with this new PC4000 memory, CPU-Z is now showing like 193.3mhz instead of the proper 250-ish numbers for the speed. Any ideas?

Hopefully my specs will show in up the signature to let everyone know what I have.
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Opty 148 CACJE 1.55vcore MSI Neo4-F with 1.6 BIOS XP 32 bit SP2 19" Fujitsu LCD FP-988D 
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Opty 148 CACJE 1.55vcore MSI Neo4-F with 1.6 BIOS XP 32 bit SP2 19" Fujitsu LCD FP-988D 
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post #2 of 37
Are you running the ram on a lower divider than 1:1? That could be the reason why the memory is slower than the HTT.
If it is running this slow, then it's unlikely to be the Ram that is limiting your o/c. If that's the case then more vcore will be needed if you want to push the CPU further.
Clevo P170HM
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Clevo P170HM
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post #3 of 37
Thread Starter 
STE -
Thanx for your reply! I have the RAM set in the BIOS at 250 which should be stock for PC4000 not? With my old PQI PC3200 2gig dual Ram, CPU-Z reported it accurately at 200, but now with the PC4000 ram it is reporting it incorrectly so I have no way of knowing how fast my RAM is running. Would Memtest tell me if I ran it?
Maybe that's why I am able to get it so high (DDR580)...cuz the ram is running slower.

As far as the CPU goes, I don't know how high of a vcore I can go and still stay safe...temp. isn't an issue as I have alot of air cooling in the case. Its at 1.49vcore now and I'd rather not go any higher.
My System
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CPUMotherboardOSMonitor
Opty 148 CACJE 1.55vcore MSI Neo4-F with 1.6 BIOS XP 32 bit SP2 19" Fujitsu LCD FP-988D 
PowerCase
600W MGE XG Vortec @ 37a Xoxide Bio-X 
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CPUMotherboardOSMonitor
Opty 148 CACJE 1.55vcore MSI Neo4-F with 1.6 BIOS XP 32 bit SP2 19" Fujitsu LCD FP-988D 
PowerCase
600W MGE XG Vortec @ 37a Xoxide Bio-X 
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post #4 of 37
Yeah, that makes sense. Those dividers faster than 200Mhz never work as they should. Set to a low divider like 100 and then test to see if the CPU can pass Prime. If it does, then it's your Ram that's unstable, if not it's your CPU. Keep your memclock at 200Mhz for a 1:1 ratio after testing.
If you don't want to go further than 1.5vcore then there's not much you can do if your CPU is unstable without extreme cooling. Just have to lower the HTT until you get it stable.
Clevo P170HM
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Clevo P170HM
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post #5 of 37
Quote:
Originally Posted by conqst99
STE -
Thanx for your reply! I have the RAM set in the BIOS at 250 which should be stock for PC4000 not? With my old PQI PC3200 2gig dual Ram, CPU-Z reported it accurately at 200, but now with the PC4000 ram it is reporting it incorrectly so I have no way of knowing how fast my RAM is running. Would Memtest tell me if I ran it?
Maybe that's why I am able to get it so high (DDR580)...cuz the ram is running slower.

As far as the CPU goes, I don't know how high of a vcore I can go and still stay safe...temp. isn't an issue as I have alot of air cooling in the case. Its at 1.49vcore now and I'd rather not go any higher.
You can go much higher on the Vcore without any worries. If you want to play ultra conservative, stay at 1.55, but some use 1.65 on air 24/7 if temps are good. As far as PC4000 and PC3200, there isn't any difference. Officially, PC4000 doesn't even exist according to JDEC. It simply means that the manufacturer guarantees it'll run at those speeds if you set it to. Look under Advanced Chipset Options and make sure that your Memclock Index Value is set to 200 and leave it there if you want to run 1:1 with your htt. As far as settings go, I think you should play around with the 10X cpu multiplier and not the 11X. You'll probably find that 10X,htt at 275,ram at 275 will be a great 24/7 setup for your machine. Don't be afraid to use more than 1.49 Vcore, you still have room to go upwards and still be safe. I suggest using 1.45 + 6.6% Vid and you'll most likely be able to run the settings suggested stable.
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post #6 of 37
Thread Starter 
I will definitely try that. Didn't think about slowing down the mem to 100 to see if its the CPU or memory.

One question though, for running the ram at 1:1 with the fsb, I would want to set it at 250 divider for a 250fsb right? If I had a 200fsb and set the ram at 200 divider, then it would be unclocked right?

What do you have your vcore at for the 2.8speed? Sounds like you have a sweet system with the gtx and 165 Opty
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CPUMotherboardOSMonitor
Opty 148 CACJE 1.55vcore MSI Neo4-F with 1.6 BIOS XP 32 bit SP2 19" Fujitsu LCD FP-988D 
PowerCase
600W MGE XG Vortec @ 37a Xoxide Bio-X 
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CPUMotherboardOSMonitor
Opty 148 CACJE 1.55vcore MSI Neo4-F with 1.6 BIOS XP 32 bit SP2 19" Fujitsu LCD FP-988D 
PowerCase
600W MGE XG Vortec @ 37a Xoxide Bio-X 
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post #7 of 37
Thread Starter 
SCCR -
Thanx for the info!
I'll try the 10x mult tonite...really didn't try that one too much, only the 11x.

As far as the mem divider, that's good info. So even if I have the divider set at 200 with a higher FSB, it will still run as fast as the fsb? What I mean is that if I have say a 250fsb and the mem is set at 200, it will not be underclocked since the mem divider is set lower than the fsb?

Sounds good about the vcore too? I thought I read somewhere not to go higher than 2.5vcore and still be safe. I think the max vcore is 1.6v right? (as suggested by AMD).
My System
(13 items)
 
  
CPUMotherboardOSMonitor
Opty 148 CACJE 1.55vcore MSI Neo4-F with 1.6 BIOS XP 32 bit SP2 19" Fujitsu LCD FP-988D 
PowerCase
600W MGE XG Vortec @ 37a Xoxide Bio-X 
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My System
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CPUMotherboardOSMonitor
Opty 148 CACJE 1.55vcore MSI Neo4-F with 1.6 BIOS XP 32 bit SP2 19" Fujitsu LCD FP-988D 
PowerCase
600W MGE XG Vortec @ 37a Xoxide Bio-X 
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post #8 of 37
Quote:
Originally Posted by conqst99
I will definitely try that. Didn't think about slowing down the mem to 100 to see if its the CPU or memory.

One question though, for running the ram at 1:1 with the fsb, I would want to set it at 250 divider for a 250fsb right? If I had a 200fsb and set the ram at 200 divider, then it would be unclocked right?

What do you have your vcore at for the 2.8speed? Sounds like you have a sweet system with the gtx and 165 Opty
Setting the memclock to 200 will always keep it at 1:1 with the HTT for all types of Ram. Then as you raise your HTT to 250 your Ram speed will rise accordingly ie to pc4000 speeds.
The 250 divider is supposed to raise mem speeds to 250Mhz with a HTT of 200Mhz, but as you've just seen, they tend to underclock the ram for some reason

I use 1.6 vcore on my CPU 24/7.
Clevo P170HM
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Clevo P170HM
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post #9 of 37
Quote:
Originally Posted by conqst99
SCCR -
Thanx for the info!
I'll try the 10x mult tonite...really didn't try that one too much, only the 11x.

As far as the mem divider, that's good info. So even if I have the divider set at 200 with a higher FSB, it will still run as fast as the fsb? What I mean is that if I have say a 250fsb and the mem is set at 200, it will not be underclocked since the mem divider is set lower than the fsb?

Sounds good about the vcore too? I thought I read somewhere not to go higher than 2.5vcore and still be safe. I think the max vcore is 1.6v right? (as suggested by AMD).
Rule of thumb for air is 1.7,but I wouldn't run that high 24/7. Yes, if you keep Memclock Index Value at 200, your ram will run whatever speed you have your htt set to (unless you use a .5 cpu multiplier). Take a look at this if you're ever unsure about ram speed with different Memclock Index values.
http://math.gogar.com/athlon64.cgi?showtable=1
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Intel 2500k Asus P8P67 Galaxy GTX580 8GB G Skill Ripjaws 
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Intel 80 gb SSD, Raptor 150 Windows 7 Home Premium 24" Samsung LCD Saitek Eclipse 
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PCP&C 750W Antec P180 Logitech MX-510 blue 
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My System
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CPUMotherboardGraphicsRAM
Intel 2500k Asus P8P67 Galaxy GTX580 8GB G Skill Ripjaws 
Hard DriveOSMonitorKeyboard
Intel 80 gb SSD, Raptor 150 Windows 7 Home Premium 24" Samsung LCD Saitek Eclipse 
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PCP&C 750W Antec P180 Logitech MX-510 blue 
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post #10 of 37
Thread Starter 
STE -
That's weird. So I guess its best to keep the mem divider ALWAYS at 200 then according to what you're telling me? To make sure I understand this right, if say I have the fsb at 275 with the mem at 200 divider, the mem will run at ddr550?

I was using the fsb at say 250 with a 250 mem divider and you say that seemed to be UNDERCLOCKING the ram....that makes sense
My System
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CPUMotherboardOSMonitor
Opty 148 CACJE 1.55vcore MSI Neo4-F with 1.6 BIOS XP 32 bit SP2 19" Fujitsu LCD FP-988D 
PowerCase
600W MGE XG Vortec @ 37a Xoxide Bio-X 
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My System
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CPUMotherboardOSMonitor
Opty 148 CACJE 1.55vcore MSI Neo4-F with 1.6 BIOS XP 32 bit SP2 19" Fujitsu LCD FP-988D 
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