Best CPU for LGA775 for an Intel Q35 Express chipset?

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  1. Posts : 191
    Windows 10 Home
    Thread Starter
       #31

    rqt said:
    "Can you play 4K videos in YouTube with that CPU?"

    I've no idea - my display is 1920 x 1080 so 1080p 60 FPS the best I can get.
    We are talking about YouTube, not videogames. You simply need to got to YT, type 4K video and put the 4K resolution in the options. Tell me if it freezes every few seconds.
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  2. rqt
    Posts : 126
    Windows 10 mainly 64 bit
       #32

    rambomhtri said:
    We are talking about YouTube, not videogames. You simply need to got to YT, type 4K video and put the 4K resolution in the options. Tell me if it freezes every few seconds.
    Not correct - I have already tried this & I don't get a 4K resolution offered in the options - 1080p is the best there.
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  3. Posts : 191
    Windows 10 Home
    Thread Starter
       #33

    rqt said:
    Not correct - I have already tried this & I don't get a 4K resolution offered in the options - 1080p is the best there.
    That's because you have not watched a 4K video... dude... type 4K video and enter one that has it available.
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  4. Posts : 4,439
    Win 11 Pro 22000.652
       #34

    rambomhtri said:
    That's because you have not watched a 4K video... dude... type 4K video and enter one that has it available.
    As a test, I set my monitor resolution to 1080p. (Native is 2160p.) I watched a 4k video on YouTube. It defaulted to 720p, but I could select 2160p. I have no idea what YouTube actually delivers under those circumstances.

    I suggest keeping the exchange polite... dude.
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  5. Posts : 191
    Windows 10 Home
    Thread Starter
       #35

    I'm pretty sure YouTube doesn't give the slightest about your resolution or configuration, dude, the 4K option is always there unless you've disabled some advanced settings in your browser. Just use your smartphone to check. Use Chrome, dood. Here's a video in 4K 60fps:
    YouTube

    Check 4K only in other video, may be 60fps4K is overkill.
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  6. Posts : 4,439
    Win 11 Pro 22000.652
       #36

    rambomhtri said:
    I'm pretty sure YouTube doesn't give the slightest about your resolution or configuration, dude, the 4K option is always there unless you've disabled some advanced settings in your browser. Just use your smartphone to check. Use Chrome, dood. Here's a video in 4K 60fps:
    YouTube

    Check 4K only in other video, may be 60fps4K is overkill.
    I tried that, just for fun. (Oddly enough, that was the 4k video I chose for my own tests.)

    It plays on the YouTube app on my old Android phone. (Galaxy Core, bought as a refurb a couple of years ago.) I'd bet, though, that YouTube isn't sending 4k data to the phone. It would fall down horribly; I doubt that it could scale down 2160p data for its display. I don't know how to check the format. I don't even see a way to change the resolution in the app. (I rarely use it. Tiny screen.)

    At the moment, I don't have a 1080p (native) PC display available to see what YouTube offers for resolutions for 4k content.
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  7. Posts : 4,439
    Win 11 Pro 22000.652
       #37

    rambomhtri said:
    Y(snip)

    With a Q9300, I can't play 4K videos, they freeze every 3 seconds.
    What graphics card are you using with that? (The Q9300 does not include a GPU.) The graphics may be the bottleneck, rather than the CPU. Another alternative is too little system RAM, although I'd guess that 4GB should be enough.
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  8. Posts : 191
    Windows 10 Home
    Thread Starter
       #38

    bobkn said:
    I tried that, just for fun. (Oddly enough, that was the 4k video I chose for my own tests.)
    It plays on the YouTube app on my old Android phone. (Galaxy Core, bought as a refurb a couple of years ago.) I'd bet, though, that YouTube isn't sending 4k data to the phone. It would fall down horribly; I doubt that it could scale down 2160p data for its display. I don't know how to check the format. I don't even see a way to change the resolution in the app. (I rarely use it. Tiny screen.)
    At the moment, I don't have a 1080p (native) PC display available to see what YouTube offers for resolutions for 4k content.

    What graphics card are you using with that? (The Q9300 does not include a GPU.) The graphics may be the bottleneck, rather than the CPU. Another alternative is too little system RAM, although I'd guess that 4GB should be enough.
    No, let me explain:
    The DESKTOP WEB version of YouTube (the one you visit using a PC, Windows 10, you know) does NOT care about your screen resolution or whatever. There, videos are shown equally to everybody, unless someone has messed up with advanced browser settings. So, it doesn't matter if you have a toaster PC, when you enter this video:
    YouTube

    You will see all the options available, including 4K 60fps. That's why I was kind of desperate when a user was saying "I'm limited to 1080p". I don't know what PC you are using and its state, but whatever that is, it should show you that option unless you messed with the browser settings. Use Chrome, a clean install, and that should do the trick.

    Now, the MOBILE WEB version of YouTube does not let you even choose the quality of the video. If you open that video in the Chrome Android app, you will enter the mobile web version of YouTube, that doesn't have any settings for quality. Nevertheless, if you set the Chrome app to "Desktop site", it will show un your Chrome app the desktop web version, and you will be able to choose 4K 60fps. Nevertheless, my smartphone can't handle that, it lags here and there, although it's not that bad.

    Finally, the APP version of YouTube, that one you download from Google Store for Android, actually DOES care about your phone, and it will hide some settings if your phone is not capable of handling it. Nevertheless, this is a Windows 10 forum, and we are talking about desktop CPU's, so this is off-topic.

    By the way, all the work is done pretty much entirely by the CPU, these videos don't normally use GPU power. It doesn't really matter what card you have, you have to got a decent CPU to handle 4K 60fps (4th gen Intel or something like that).
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  9. Posts : 191
    Windows 10 Home
    Thread Starter
       #39

    So... I've finally did the upgrade. In an OptiPlex 755 I've just changed few min ago:
    1. Original CPU Core2 Duo E6750 2.66GHz 65W replaced by a Core2 Quad 9550 2.83GHz 95W
    2. Original on-board Intel Q35 Graphics replaced by a nVIDIA GT 730 1GB GDDR3 23W
    3. Planning on adding an SSD, of course.
    After replacing the components, I have done a CMOS reset and reset the BIOS to default, then I reconfigured it again. My first main concern was... with all this added power, will it turn on and be stable?
    OF COURSE IT WILL!

    The original power supply unit is 280W. I've checked it and under full load prime95 + furmark, I get between 160-180W usage. I still have room for 100W, what?! FANTASTIC!!!
    Temperatures are fine, I'm getting 74șC max in the Q9550 and 84șC max on GT730, so it's perfect, specially considering it's a stress test. Under idle-normal conditions, they are between 45-55șC.

    Everything seems to work just fine, Windows recognizes everything... but, there's one thing that bugs me:
    The Q9550, under full load, is "only" at 2.60GHz, while it's a 2.83GHz CPU, and it stays at 90% of usage. Looks like it's "locked" under 2.66GHz, which happens to be the clock of my old CPU.

    Even setting the Prime95 alone, still 90% usage. Doing a WinRAR benchmark, same, 90%. Nevertheless, doing a WinZIP benchmark, I get 92%, and the Q9550 goes like this: stays in 2.66GHz for 3s, then lowers to 2.54GHz for 5s, then back again to 2.66GHz, and so on. It's a cycle of peaks.

    Is this the normal behavior of a Q9550 or somehow the MoBo is not able to supply the CPU the power it needs? How can I check that? Why lower GHz?
    There's nothing limiting the CPU neither in Windows or the BIOS.
    Could it be that, even after recognizing the CPU and clearing the CMOS, the task manager is still stuck with the old E6750 CPU values?

    EDIT: OK, CPU-Z is giving me other values. CPU-Z gives me 2.83GHz, while task manager is giving me at that same moment 2.60GHz. May be it's just task manager buggy after the swap?
    I've checked the CPU-z screenshot of another Q9550 and everything is the same except:
    Core VID: I have 1.238V, the screenshot has 1.32V
    Bus Speed: I have 332.83MHz, screenshot 449.95MHz
    QPI Link: I have 1331.30MHz, screenshot 1799.94MHz

    I did the PassMark test, and I'm getting single core 1198 (against 1197 announced) but in the multicore mark I get 3846 (against the 3962 announced). Is that alright?
    Last edited by rambomhtri; 02 Oct 2019 at 10:48.
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  10. Posts : 913
    CP/M
       #40

    Congrats.
    CPU Frequency: Task Manager reports wrong values, use CPU-Z. Under load, it should look similar to this:
    Best CPU for LGA775 for an Intel Q35 Express chipset?-.png
    Check Core Speed, Multiplier, Bus Speed & FSB values - they can depend on BIOS settings.
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