Will this setup hit 4.5 ghz?

[Homeboy2]

Hi,
I have a E8500 cpu E0 stepping , T.r.u.e heatsink with Noctua fans in push/pull config, Asus p5q Pro mb, and 4 gb of corsair DDR 800 (TWIN2X4096-6400C4DHX) I know the cpu and hs are as good as it gets but i dont know about the oc capabilities of the board and ram. Should i exchange the ram for 1066?

 

[runswindows95]

No. No guarantees on any system on how far it will go when it comes to overclocking. Too many factors involved.

 

[eklipz330]

whats stopping you from testing it out?
E0 stepping is good, and mobo is good... so whats the problem now?

 

[Homeboy2]

I know oc ing is a crap shoot. I should have clarified, i dont actually have the mobo in my possession its on the way. My main question is , will the ram be good enough?

 

[eklipz330]

well if you loosen the timings, you may be able to get it to 950mhz... seeing how that's where you would need to be for a 1:1 ratio with a e8500 @ 4.5ghz

4500mhz/9.5[multi] ~475[fsb]x2[ddr]=950mhz

i don't know about the OC'ing potential on the ram, but you should at least be able to hit 900mhz with it

 

[richardscott]

well im runnaing a e8400 at 1.5v to get prime stable at 4.4ghz so yea i got dud chip but id rekon ud still need 1.4-1.45v to hit 4.5ghz.

 

[zenmaster]

Not Likely.
4.5ghz is considered higher than is normally attainable with the E8500.
Do some folks hit it? Sure.
But not most chips.
And most that do hit it, do not hit it at a safe voltage.

 

[evilshuriken]

When I overclock I tend to go for a speed I can keep 24/7. Wouldn't the voltage required for 4.5ghz severely shorten the chips lifespan?
And what is the point in overclocking that high?
Is there any game that would be bottlenecked with a 3.8ghz(a safer frequency) cpu? And if you say you need that speed for very demanding applications such as raytracers... then why didn't you go with a quad, which would do much better in those situations?

 

[Homeboy2]

well, if it cant hit 4.5 so be it, the reason i didnt buy a quad is because i got a good deal on it.

 

[anartik]

Probably not just because of heat. I'm using an Ultra 120 extreme and an E8500 (both lapped) in a very well ventilated Lian Li PCV1010 and CPU runs about 2x ambient temp which means I usually idle about 48-50C(realtemp). When you combine the heat from 8500, X48 and my 8800GTX its a problem. The computer is in an AC'ed room about 11x11ft and it will quickly raise room temp by 5F+. I am running 450x9.5=4.275 with voltage at 1.475 on Asus Rampage formula. On a cool day I can run 460x9.5=4.37 at same voltage. There is still a little room to go if heat was not an issue. In either case idle is around 50C and Prime will take it very close to TJunction. If it does hit TJunction prime fails which is dependant on room temp. I really don't believe much more is possible on air. While prime is iffy depending on room temp I am able to game, fold and do any other task or benchmark w/o issue. In fact fold often runs 24x7. With nothing else going on and display on in folding the CPU runs about 68C and the 8800 (620/2000) about 75C using the new Nvidia Cuda version.

I don't like to ever reduce the performance of ram. I don't believe in relaxing timings or running at less than its advertised speeds. With that in mind I highly recommend at least DDR2 1066. I am using a OCZ 2x2gb 1066 kit and it is ideal. I am using a 5/4 bootstrap and the ram runs at 1104 (fsb 460) with stock 5-5-5-15 timings. Maybe not necessary but have voltage at 2.19 vs stock 2.1. It runs equally as well at FSB 450.

Just to put things in perspective the case has a 140mm in the isolated lower chamber blowing over the drives and exhausting through a 140mm in Corsair PS. The upper chamber has a 140mm intake(not stock), 120mm midsection, 120mm rear exhaust. The Ultra 120 has a 110CFM and the 8800 is using the stock cooler with a slot cooler next to it exhausting the bypass on the 8800 stock cooler. All have been upgraded from the stock Lian Li fans to higher CFM Scythes. The case is well exhausted but all that heat being pumped out has to go somewhere.

 

[richardscott]

yea 4.5ghz is really fast, i can get superpi at 4.8 which puts it under 10 secs, but for 24/7 if its going to be used alot dont shoot to high cos with air cooling and high voltages you could break it within a year or less.

 

[eklipz330]

he said he had a E0 stepping, i've seen quads go up to 4.2 with E0, a dual should do tha tmuch better

 

[cd14]

Hi,
I have a E8500 cpu E0 stepping , T.r.u.e heatsink with Noctua fans in push/pull config, Asus p5q Pro mb, and 4 gb of corsair DDR 800 (TWIN2X4096-6400C4DHX) I know the cpu and hs are as good as it gets but i dont know about the oc capabilities of the board and ram. Should i exchange the ram for 1066?

It's possible, but the E8500 probably won't run at that speed for long (I'm talking about a month). I've had two E8500 (E0) and a E8400 and all of them thirst for more voltage as time went by. Also, they started to act erratic during stressing; they would pass at one setting and as soon as it rebooted it would fail. They seem to degrade over time at high voltages and speed unlike the 65nm chips.

I also have the Corsair 6400, but one gig sticks. These seem to overclock well (of course at higher timings). One pair was able to reach 1000mhz consistently.
Currently I have a 4.51 ghz E8500 EO running. It takes about 1.46v and reaches 74c under water (I still think these 45nm chip temps are read incorrectly).

As everyone is saying, CPUs are not equal at overclocking--I've had duds too.

 

[Homeboy2]

thanks for the input cd , im wanting to put in another 4 gigs of ram, and i understand that can mess up overclocks so im gonna have to lower expectations to 4ghz or less. whenever i finally get this thing put together im gonna post results.

 

[Gravemind123]

Other issue I could see is that the ram itself is probably not too good at overclocking. In general higher density = lower clockspeeds and if you want to add more ram, the more ram sticks the lower the max speed tends to be.

 

[Homeboy2]

4275 for a couple hours running prime95, so far so good, fsb 450mhz, core voltage 1.35. update later. 475 fsb game me a BSOD. What other settings should i be looking at. im willing to bump voltage a tad but not much. I know 1.3625 is the recommended max but is 1.40 feasible for 24/7?

 

[zenmaster]

Have you tried bumping your RAM voltage?
I would not really be worried about pushing more.

Trust me, you will need feel the difference between 4200 and 4400.
You may be able to bench mark the difference, but you will not feel it.

4.2Ghz will give you a really nice processor.
You should not see any bottleneck in gaming.

 

[Homeboy2]

how much can the ram be bumped? I know there is really no need to go higher in speed just like to tinker.