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Any chance to get a 4.5 Ghz i7 5775c

post #1 of 15
Thread Starter 
see Topic description.
post #2 of 15
No, the best 5775Cs we had were 4.3GHz, and we're no longer binning more of them. We do have a free delidding promotion on the 5775Cs we have left through June, promo code "5775CDELID" if interested.
post #3 of 15
Thread Starter 
Alright, thx for the Info appreciate it smile.gif
post #4 of 15
ive had a i5 5775c mac ull get is 4.2-4.4 4.4 is usually only doable on the i5 broadwell

and id take that chance if I was you free delidding too thumb.gif
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Code55
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CPUMotherboardGraphicsRAM
i7-6700k 4.8 Asus Impact VIII / EK M8i Monoblock SeaHawk EK X 1080 Ti G.Skill Ripjaw V 2 x 16GB 3733CL15 1T 
Hard DriveHard DriveCoolingMonitor
INTEL 750 400GB U.2 SanDisk Extreme Pro 960GB EK D5 PWM Acer X34A 
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post #5 of 15
I have one, and I think it is good chip but I can't get stable 4.5 with any voltage. 4.4 is possible but I would like to hear Silicon Lottery opinion about safe voltage.

when I tested it first time, I still didn't have RAM which was ordered, so I put one stick of 2gb DDR3 1600mhz. don't remember timings but it was standard, voltage 1.5V.

4.4 core voltage passed stress test fine at 1.39V, with 2V of core input voltage. it was also winter time, so maybe it did also help little. anyway, temperatures were really good.

4.5 wasn't stable even at 4.75V so I give up and didn't want to try anymore.

but after I put 2x8gb DDR3 RAM 2400mhz C10, looks like now it is much more voltage hungry. I did not tested much, but as I remember I couldn't get it stable at even 1.44V. at that voltage, temperature start to rising.

maybe I need to play with sistem agent voltage, and others (don't remember names) ?

I ordered now deliding kit, so I plan to do it to further temperatures, maybe that helps.

but I do not have idea which is safe voltage limits for this cpu. is it same as Broadwell-E because of same process node and same architecture? I can see you are shipping them at 1.44V (or less).

as I can see, Skylake 14nm tolerate higher voltages than Haswell 22nm.

also, one info which can be good for all users of 5775C including one who started the thread. I had done Aida64 memory and cache tests, and found some interesting things about L4 cache.

when altering eDRAM ratio in BIOS, it have totally negative effect on L4 speed and it become slower than RAM. only Auto settings work fine.

but overclocking Uncore ratio, have big impact on L4 speed. try it yourself.

when we talk about Uncore, to run it 4.0, I need around 1.36V.
4.1 also require more than 1.4V

I would be really happy if I could run 4.4 core and 4.1 uncore, but please let me know about how much voltage should be safe.
post #6 of 15
When we were binning 5775Cs, we only used up to 1.328V. My best guess on safe voltages assuming temperatures are under 80C and no heavy AVX2/FMA3 stress testing would be under 1.45V on the core, and under 1.3V on the uncore/cache.

This is my best guess based on the experience I've had with all of Broadwell, and even Haswell. The cache is much more delicate than the core.
post #7 of 15
ok. than I will go 4.3 core and 3.9 cache.

as I remember less than 1.35V will be enough for 4.3 core, and less than 1.3V for 3.9 cache.

but I have some other problem and question, let me explain. I prefer using Win7 and would like to stay on it if possible, but under Win7 this cpu operate around 20-30% (depenting od test) slower than under Win10.

also, Aida64 Memory and Cache test, shows that L4 operates under Win7 at stupid slow speeds (much slower than my DDR3 2400mhz). with Win10, it operates how it is supposted.

I do not know is L4 only problem here and hence reason for all benchmarks to yield lower scores, or there is also another slowdown in cpu with Win7. I tested with Cinebench C15, CPU-Z, Passmark.

all drivers are installed including chipset driver from Asus website for my motherboard (Asus Deluxe Z97 usb3.1 nfc&wlc).

I would be very interested to somehow make this cpu work under Win7 with 100% potential biggrin.gif
post #8 of 15
Quote:
Originally Posted by adversary View Post

ok. than I will go 4.3 core and 3.9 cache.

as I remember less than 1.35V will be enough for 4.3 core, and less than 1.3V for 3.9 cache.

but I have some other problem and question, let me explain. I prefer using Win7 and would like to stay on it if possible, but under Win7 this cpu operate around 20-30% (depenting od test) slower than under Win10.

also, Aida64 Memory and Cache test, shows that L4 operates under Win7 at stupid slow speeds (much slower than my DDR3 2400mhz). with Win10, it operates how it is supposted.

I do not know is L4 only problem here and hence reason for all benchmarks to yield lower scores, or there is also another slowdown in cpu with Win7. I tested with Cinebench C15, CPU-Z, Passmark.

all drivers are installed including chipset driver from Asus website for my motherboard (Asus Deluxe Z97 usb3.1 nfc&wlc).

I would be very interested to somehow make this cpu work under Win7 with 100% potential biggrin.gif

Sorry, I don't have the answer to your question. I have only used 5775Cs under Windows 8.1 and 10, and haven't noticed a difference between the two. You might be able to find some more help here: http://www.overclock.net/t/1583537/intel-broadwell-c-ownership-club
post #9 of 15
Silicon Lottery, do you know about safe voltage level for RAM? Also, Sistem Agent and other, VCCIO, Input voltage.

There is really no much users of 5775C so it is pretty hard to find useful information.

What confuses me about RAM and 5775C is fast Intel state, as I can see on their site, that DDR3L is recommended, but voltage is same as for DDR3 - 1.5V. What interester me most, is OK to use 1.65V DDR3?
post #10 of 15
Quote:
Originally Posted by nizinizi View Post

Silicon Lottery, do you know about safe voltage level for RAM? Also, Sistem Agent and other, VCCIO, Input voltage.

There is really no much users of 5775C so it is pretty hard to find useful information.

What confuses me about RAM and 5775C is fast Intel state, as I can see on their site, that DDR3L is recommended, but voltage is same as for DDR3 - 1.5V. What interester me most, is OK to use 1.65V DDR3?

1.35-1.5V DDR3 or DDR3L should be considered stock operation.

I personally would have no problems running 1.65V memory, but treat it as an overclock along with the standard potential consequences that can come from overclocking.
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