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Do I really need a i5-2500k

My current laptop (alienware m11x-r2) has an i7 640UM. I am going to build a desktop machine and need some help choosing a processor. I had been looking at the i5 2500k.

At http://www.cpubenchmark.net/
I found the following information: (PassMark CPU Benchmark)
i7 640UM = 1593
Phenom II X4 955 = 3971
i5 2500k = 7441

Does this mean, roughly, that the Phenom II X4 is > 2X speed of the i7 640UM, and the i5 2500k is almost 2x faster than the Phenom?

My laptop is pretty good for what I do speed wise, I just need better gpu, so I was hoping I could get the Phenom, or a lesser i5 or other SB and save some $. I probably could live with something between the Phenom and the i5 2500...

I don't know that I want to bother with overclocking, so I am not sure I need the 2500K. is the difference in the 2500 and the 2500k just that you can overclock the 2500K? If I go with a non-overclocking CPU, can I save money on a mobo?

Any suggestions on a CPU/mobo? I have a mobo picked out but the CPU (i5 2500k) and mobo (GA-Z68XP-UD3) together are going to run my close to $370. I was hoping to stay under $300, with my total budget ~ $600.

CD
32 answers Last reply
More about 2500k
  1. Never worth the money to get a 2500 and not a 2500k, you never know, you might decide to OC it and get a 50% performance increase for nothing,.

    Yes the 2x scaling is about right.
  2. Unless you are heavy gaming though, saving money with an AMD 955BE is a great chip still. I use it in my system and i see no performance issues. I will add though, i will recommend you OC this chip if you go with AMD, otherwise the i5 2500k is the better bet.

    With OC'ing, you will need an aftermarket cooler though, such as the Hyper 212+ EVO, H80/H100, Noctua D14.

    with your budget, i would not suggest going intel. You will sacrifice too much from Case/PSU support which is very much needed for gaming rigs, and outdate themselves far slower than cpu/mobos.
  3. Here are the differences between the Intel® Core™ i5-2500 and then Intel Core i5-2500K:

    Intel Core i5-2500
    -Support for TXT (Trusted Execution Technology) a business level virus protection feature.
    -Support for VT-d (Virtualization with Directed I/O) with supported boards allow you to assign hardware to a VM.
    -Intel HD 2000 Graphics.

    Intel Core i5-2500K
    -Unlocked multiplier (allows easy overclocking by simply changing the multiplier in the Bios)
    -Intel HD 3000 Graphics

    There is about a $15 price difference between these processors. So to pick up the ability to get a great deal better performance in the future for $15 is very nice option.


    Christian Wood
    Intel Enthusiast Team
  4. I think you should stick with your current motherboard((GA-Z68XP-UD3) and change the cpu to i3 2100.i3 2100 will not only save you around $70 but it will also performs better than p2 955 in most games.Also you can upgrade your cpu to ivy bridge later when you need more performance.
  5. If you're not a heavy gamer or do heavy work like folding, stick with a cheaper option. If you do do those things, there are no better option than the 2500k at that price point.
  6. phatbuddha79 said:
    If you're not a heavy gamer or do heavy work like folding, stick with a cheaper option. If you do do those things, there are no better option than the 2500k at that price point.


    But it loses a great deal of its luster if you don't OC. It would barely be a blip on the radar if there was no K series.
  7. sayantan said:
    I think you should stick with your current motherboard((GA-Z68XP-UD3) and change the cpu to i3 2100.i3 2100 will not only save you around $70 but it will also performs better than p2 955 in most games.Also you can upgrade your cpu to ivy bridge later when you need more performance.


    The system he listed is a laptop. So I doubt his current MB is a GA-Z68XP-UD3
  8. celticdaddio said:

    My laptop is pretty good for what I do speed wise, I just need better gpu, so I was hoping I could get the Phenom, or a lesser i5 or other SB and save some $. I probably could live with something between the Phenom and the i5 2500...

    I don't know that I want to bother with overclocking, so I am not sure I need the 2500K. is the difference in the 2500 and the 2500k just that you can overclock the 2500K? If I go with a non-overclocking CPU, can I save money on a mobo?

    Any suggestions on a CPU/mobo? I have a mobo picked out but the CPU (i5 2500k) and mobo (GA-Z68XP-UD3) together are going to run my close to $370. I was hoping to stay under $300, with my total budget ~ $600.

    CD


    The difference comes down to price. Both parts are worth the money. Just depends on how much you wish to spend. If money is a little tight, and it sounds like it is, go Phenom.
  9. FALC0N said:
    The system he listed is a laptop. So I doubt his current MB is a GA-Z68XP-UD3


    I meant he should stick with the motherboard he choose for the i5.
  10. sayantan said:
    I meant he should stick with the motherboard he choose for the i5.


    Ahhh.....you meant his prospective new motherboard. That makes more sense.

    For a minute, I thought alienware was really stacking those laptops.
  11. FALC0N said:
    But it loses a great deal of its luster if you don't OC. It would barely be a blip on the radar if there was no K series.


    I see no point in getting a K edition if you're not going to overclock, total waste of a good cpu and money.
  12. Quote:
    as, said above an i3-2100 would be your best bet, it have fantastic performance, in gaming, uses less power than the phenom 955 (about half as much power), and therefore less heat/noise too, heres a nice comparison:

    http://www.anandtech.com/bench/Product/88?vs=289

    if your not overclocking the i3-2100 imo is the one to go for.


    I lean 955 in that range unless you are in a power sensitive environment. Doubly true if your going to OC.
  13. Sure a 955 system would be cheaper but a Z68 board with i3 would certainly pay off in long run.I don't think he would be able to go much further with an OCed 955 and he would need to upgrade his system very soon.It should be kept in mind that IVY bridge would be drop in compatible with Z68 and may even support PCIe 3.0*(not sure though).Also an OCed 955 would only match the performance levels of stock i3 2100.
    *As per Anandtech PCIe 3.0 is technically possible on all SB motherboards but Intel might make it exclusive to 7 series mobos.
  14. i would recommend these specs..
    intel i5 2400
    intel dh67cl(intel motherboards are the most stable motherboard manufacturers in the world if u are not overclocking ..)
    msi gtx 560ti
    corsair value select 4gb 1333mhz
    corsair 500cx psu
    antec 300(my choice but u can change to any other as cabinet doesnt matters a lot)
  15. since your total budget is $600, I would not go with the i5-2500K as you would have much less remaining for the gpu. What I mean is , a 2500k pair with a 6850 for example would still be slower for almost all games vs an i3-2100 (or phenomx4) with a 560ti/6950.

    I would go with the i3-2100 personally. It is an amazing processor for the price, uses much less power than the AMD quad and you don't have to overclock it.
  16. I will say 955... About the same price as an i3-2100, and its a BE, so its fun to OC. If you get either of these too, the chances of you having to upgrade the CPU sooner than later is very high. So get the cheapest and focus on a great GPU, since imo that matters more.
  17. sayantan said:
    .Also an OCed 955 would only match the performance levels of stock i3 2100.
    .


    Thats not true at all. Its matched at stock. It exceeds it when OC'd
  18. FALC0N said:
    Thats not true at all. Its matched at stock. It exceeds it when OC'd

    Well what I can see is in most of the benches 955 lags behind 2100.So its definitely not matched at stock clocks.
    http://www.anandtech.com/bench/Product/88?vs=289
  19. Really if you're going the AMD route forget Thuban.
    Did everyone forget the FX series is out?

    (2500k owner here btw)

    Don't forget that clocks aren't everything, lol like damn Pentium 4!
  20. FX is for server use. definately not gaming chips. if you are going AMD, either a 955BE or 960T Zosma (possible 6-core) for the $120 range, and the 1090T for a true 6-core.
  21. Oh, that's what they're targeted at now? Man, people were going nuts about BD not too many months ago. Pity.
  22. Quite frankly, AMD has always favored Server/applicational use first, and then tweaked their chips for the gamer community. This hurts, as i had high hopes, but in all reality, all games take advantage of 2-4 FAST cores, rather than many multiple cores on a chip, with exception to maybe BF3.
  23. I don't game at all, but do write GPU intensive applications for work, involving CUDA 4, and lots of advanced GL stuff.

    A lot of good information here... still a bit confused though... in summary it sounds like these are the two prevailing thoughts so far...

    Stick with the chosen mobo and choose a lower cost intel cpu, somewhere between an i3-2100 and and i5-2500k (the i3-2100 seems very popular... it's only dual core though right?). If I do this, and choose the i3-2100, will I be able to upgrade CPU without replacing mobo? IOW, upgrade to the ivy bridge when it comes out?

    Go with the phenom II 955BE and overclock the heck out of it. If I go this route, I would not be comforatble without knowing that I can upgrade later to a faster/better CPU. What does the outlook look like for AMD cpus? I suppose I need to make sure the chosen mobo supports the next generation of AMD cpus... Is this the FX line? Any suggestions on the mobo? I would probably lean towards the AMD equivalent from the GIGABYTE line.

    Just curious... no one suggeted the AMD APU line... Avoid?

    And... is the z68 the chipset I want on the intel mobo?


    CD

    celticdaddio said:
    My current laptop (alienware m11x-r2) has an i7 640UM. I am going to build a desktop machine and need some help choosing a processor. I had been looking at the i5 2500k.

    At http://www.cpubenchmark.net/
    I found the following information: (PassMark CPU Benchmark)
    i7 640UM = 1593
    Phenom II X4 955 = 3971
    i5 2500k = 7441

    Does this mean, roughly, that the Phenom II X4 is > 2X speed of the i7 640UM, and the i5 2500k is almost 2x faster than the Phenom?

    My laptop is pretty good for what I do speed wise, I just need better gpu, so I was hoping I could get the Phenom, or a lesser i5 or other SB and save some $. I probably could live with something between the Phenom and the i5 2500...

    I don't know that I want to bother with overclocking, so I am not sure I need the 2500K. is the difference in the 2500 and the 2500k just that you can overclock the 2500K? If I go with a non-overclocking CPU, can I save money on a mobo?

    Any suggestions on a CPU/mobo? I have a mobo picked out but the CPU (i5 2500k) and mobo (GA-Z68XP-UD3) together are going to run my close to $370. I was hoping to stay under $300, with my total budget ~ $600.

    CD
  24. if u dont want to oc then why u go for z68 ? Get someother chipset
    z68 is pop for ocing.which u dont want to do
    and why take i5-2500k ? - cuz it has hd gfx 3000
    z68 is for ocing both gpu and cpu , p67 is for cpu oc . So i can say take the h61 or h67 . If u want the upcoming ivy bridge cpu dont use anyother chipset
    btw if u own an alienware why so cheap pc ? If u sell it u will get a larger budget to spend
  25. I like having the alienware m11x for when I travel, which is pretty often.

    Why go for Z68? I don't know. That's why I ask... I don't know the pros/cons for the different chipsets.

    But if I want to upgrade to ivy later, I have to use Z68?
    cd

    Anonymous said:
    if u dont want to oc then why u go for z68 ? Get someother chipset
    z68 is pop for ocing.which u dont want to do
    and why take i5-2500k ? - cuz it has hd gfx 3000
    z68 is for ocing both gpu and cpu , p67 is for cpu oc . So i can say take the h61 or h67 . If u want the upcoming ivy bridge cpu dont use anyother chipset
    btw if u own an alienware why so cheap pc ? If u sell it u will get a larger budget to spend
  26. sayantan said:
    Well what I can see is in most of the benches 955 lags behind 2100.So its definitely not matched at stock clocks.
    http://www.anandtech.com/bench/Product/88?vs=289



    Did you actually read your own link?

    The 955 by count wins 16, loses 12, and ties 1. So I would love to hear you elaborate on how it "lags behind" or is "definitely not a match" with processor "in most benches" when your own link suggest otherwise.
  27. IntelEnthusiast said:
    Here are the differences between the Intel® Core™ i5-2500 and then Intel Core i5-2500K:

    Intel Core i5-2500
    -Support for TXT (Trusted Execution Technology) a business level virus protection feature.
    -Support for VT-d (Virtualization with Directed I/O) with supported boards allow you to assign hardware to a VM.
    -Intel HD 2000 Graphics.

    Intel Core i5-2500K
    -Unlocked multiplier (allows easy overclocking by simply changing the multiplier in the Bios)
    -Intel HD 3000 Graphics

    There is about a $15 price difference between these processors. So to pick up the ability to get a great deal better performance in the future for $15 is very nice option.


    Christian Wood
    Intel Enthusiast Team

    sir as u said that $15 doesnt matter..but if he buys a k series cpu he have to invest money on a p67 board ,a good cpu cooler..with a i5 2400 he will be satisfied with an h67 chipset mobo which are cheaper and the remaining money he could invest it in a better gpu..
  28. ^ he wouldn't need to buy an aftermarket cooler, and an H67 and a P67 aren't that great of a price difference to jump him up to a better gpu. thats absolutely ridiculous
  29. if he didnt buy a aftermarket cooler he could not overclock even to 4ghz ..and u are totally wrong that h67 and p67 chipset are not much difference ..take a asus p8p67 pro and asus ph67 evo which are best two mobos check the prices of those and say again if the prices dont differ much..
  30. Do you really need a 2500k?
    What will you use it for?

    Gaming at 1080p?
    Spend most of your budget on the gpu.

    If its in your budget go for it.
    If your on a bit of a tight budget and you have to choose between better cpu or gpu choose gpu
  31. FALC0N said:
    Did you actually read your own link?

    The 955 by count wins 16, loses 12, and ties 1. So I would love to hear you elaborate on how it "lags behind" or is "definitely not a match" with processor "in most benches" when your own link suggest otherwise.


    From my point of view: 955 wins 14,loses 12 and ties in 3.But it loses in all games by a good margin except L4D,which I think is a good enough reason to choose i3 2100.
  32. sayantan said:
    From my point of view: 955 wins 14,loses 12 and ties in 3.But it loses in all games by a good margin except L4D,which I think is a good enough reason to choose i3 2100.



    Perhaps you might want to consider the OP and his needs in the future. He did say he doesn't game.

    I think its wonderful that you think gaming is important. But he doesn't.
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