WJames

Thanks for your reply, @Prema. Sorry I misspelled your name in the last post.

I have played with a few different NVMe drivers: the Samsung drivers (version 1.4.6.7 and "rev10"), the default Microsoft Windows 10 driver, and the Intel drivers (versions 1.1.0.1004, and 1.3.0.1007). The performance with the Intel 1.3.0.1007 driver was horrendous - definitely geared only towards the Intel SSDs. The Intel 1.1.0.1004, Microsoft, and rev 10 Samsung drivers all had similar performance. However, the older 1.4.6.7 Samsung driver provided slightly better performance, so I am sticking with it for now.

While the SM951 NVMe performance appears mostly limited by the 4 lane version 2.0 PCIe, I also found that the CPU clock and memory timings affect the benchmarks, so I am also running with somewhat more aggressive settings. With the older Samsung NVMe driver and the tighter settings, my AA SSD sequential read benchmark increased from about 1350 MBs to about 1450 MBs.

As more and more NVMe SSDs are released, I will watch for different drivers and see if any increase my benchmarks. For now, I believe I am probably about maxed out.

Thanks again for your feedback, @Prema.

Hi, @Perma. I have a P770ZM, and I am using your wonderful BIOS. I recently installed a Samsung SM951 NVMe in the M2 slot with 4 PCIe lanes. I have seen many posts with sequential read benchmarks approaching 2000 MBs using AA SSD. However, I am only seeing around 1350. Is there a setting in the BIOS that I should tweak to improve the throughput?

Thanks much!

W James

I was wondering if there is an unlocked BIOS for the MSI Cubi (http://us.msi.com/support/bb/Cubi-Mini-PC-Kit.html#down-bios). The current version, 850, is rather vanilla, and doesn't let me tweak RAM timings. The current BIOS is also running my 1866 paired DDR3s at 1333.

Thanks in advance!

W James

Here's a report / zip for the Clevo P770ZM...

Clevo P770ZM.zip

indeed, which u can also see in the batcave OP where i did power measurements with everything overclocked check my sig for that

ps: its the p750zm btw, not the p770zm

Sent from my Nexus 5 using Tapatalk

Good charts, @jaybee83. They definitely show that a hard core overclock with the 230W PSU would be pushing the PSU's limits. I wonder if the "whine" that some owners are reporting is because of they are exceeding the power rating on the PSU. *shrug* I was concerned about noise, but my unit has been very quiet. However, my CPU is locked and undervolted at 4 GHz, and I only marginally OC the GPU. Other than an audio driver issue I had early on, this unit has been flawless.

Anandtech has a good article on overclocking a P770ZM: AnandTech | Clevo P750ZM: GTX 980M Overclocking Investigated

The article mostly focuses on GPU overclocking as the author notes that overclocking the 4790K may introduce some cooling issues. I found the section on power requirements very enlightening. I think most people - myself included - assumed that a 230W power supply would be more than sufficient. However, the power usage charts show otherwise. If you are heavily overclocking both the 4790K and the 980M, you are probably exceeding the power ratings on the 230W block.

Thanks much for your efforts, @J95. The driver tweaks worked perfectly!

Wow, @jaybee83! That is indeed an awesome core voltage / OC! Did you delid to obtain those values?

Its not a Haswell thing it's a Clevo thing. My desktop 4790k is set at 100 BCLK and stays at 4700MHz with virtualization enabled. I can't speak about other laptops but spread spectrum is not enabled by default on my Z87 Maximus VI Formula and doesn't cause any issues. Enabling it will actually make my overclock unstable. Haswell is much more sensitive to core frequency instability than previous chips - my 4.7GHz overclock is totally stable - at 4.7GHz. If I turn on power management instead of high performance, it will BSOD at some point when the clock frequency is going up and down.

Yeah, the Clevo and Haswell do seem a bit more touchy with BCLK/bus settings. Have you had any luck changing the BCLK? So far, I haven't been able to adjust it at all.

I just got a new laptop (Clevo P770ZM) and I need to pick a few time sinks to spend countless hours PvPing.

While Dark Age of Camelot Unchained looks promising, it will not be released until late this year (at the earliest). So I am looking for recommendations for MMOs with a serious PvP emphasis that are out now or soon to be released.

Thanks in advance for your two cents.

There are a couple nice thermal paste comparisons at Tom's Hardware..

Thermal Paste Comparison, Part One: Applying Grease And More - Everything You Wanted To Know About Cooling A CPU

Thermal Paste Comparison, Part Two: 39 Products Get Tested - 39 Thermal Compounds Get Benchmarked And Tested

I have used AS5 mostly in the past. However, I used CLU on my new Clevo P770zm. So far, the results have been good, but that liquid metal is a little more tricky to safely apply.

isnt there also an option to set that spread spectrum in the premamod bios? maybe one could set it to a smaller calue to have less fluctuations

Sent from my Nexus 5 using Tapatalk

Yes, in fact, there is a spread spectrum option. I repeatedly reduced that value and tested. I found that the spread could be set to 0. However, there apparently is still a little overhead, as my bus speed doesn't quite reach 100 MHz, but 99.8 will do.

Thanks again, Jaybee.

@WJames

That's called spread spectrum (down) and normal for every single system...

It is the same for all bios and is an intentional instrument to balance the frequencies between different parts of the system.

Thanks for the info, Prema. That makes perfect sense. I have seen that behavior with my other computers / laptops, but I have never seen the bus speed decrease this much - by as much as 7% below the target bus speed. Typically, I only see the bus speed fluctuate a percent or two.

However, based upon a recommendation from another 4790k owner in another forum, I disabled virtualization in the BIOS. Presto! My bus speed is now pegged at 99.76 MHz! I have virtualization enabled on my other laptops, and it seems to have little impact, but on this processor (and perhaps all Haswells), the effect is very noticeable.

Thanks again for your help and explanation, Prema!

By the way, have you considered exposing the BCLK strap in your BIOS? While researching my bus speed issue, I found numerous interesting articles on the potentials of that option.

have u tried changing the bclk speed in the bios? its in the advanced / intel icc section

also try and flash back to the stock bios to check and see if its really due to the premamod or not.

Sent from my Nexus 5 using Tapatalk

Thanks for your quick reply, Jaybee.

I tried changing the Intel ICC -> BCLK value. Unfortunately, it is more or less locked at "10000", which translates to 100 MHz. Increasing that value by more than a few points results in a lock-up.

I also followed your advice to restore the stock BIOS. Unfortunately, that did not solve the bus speed issue. However, the bus speed is slightly faster now - it fluctuates between 95 and 97 MHz.

*Shrug* Anyone else experiencing this problem or can offer a solution / suggestion?

Thanks again!

My apologies if this subject has already been addressed, but I did a search and could not find a match...

I have P770ZM Clevo laptop. I recently loaded Prema's BIOS. While I love all the options in the BIOS, I noticed that my bus speed in CPU-Z is now fluctuating between 93 and 95 MHz, and that my core speed is now averaging about 3.75 GHz instead of the 4.0 GHz at which it is locked (speed step disabled). The same CPU speed was also reported in Fire Strike. I could have swore that in the past my bus speed was always at 100 MHz. I have tried numerous changes in the BIOS, but my bus speed continues to run between 93 and 95 MHz.

Any suggestions to resolve this issue would be greatly appreciated. Thanks much!

Btw, my laptop is running a i7 4790K with 8 GBs RAM running at 1887 MHz.