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Thread: E5200 + GA-EP45-DS3P Overclock help




  1. #21
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    Default Re: E5200 + GA-EP45-DS3P Overclock help

    If you mean the card clocks cause instability then it's probably to do with GPU voltage. Cooling is certainly not the issue as long as the water block also covers the VRM's at the edge of the card next to the PCIe power sockets. The 4870 as with other 48xx series cards can have voltages set in the BIOS of the card for each set of clocks it uses. For 2D it will down volt, as with for low power úD (windowed 3D for instance). Your card might not be set to use the full voltage it's capable of even at full 3D clocks. Some manufacturers do this to make there seem more of a difference between their standard and overclocked versions. You may think that you're getting a better binned chip, when in reality the standard cards have been set to eg 1.30V and the OC versions to 1.42V.

    You can open up the BIOS with |RBE (Radeon BIOS Editor). You don't have to flash if you don't wish, but at lrast this will show you what voltage the GPU uses for full 3D and if you can increase it. The increases are in fixed values determined by the BIOS lookup table. If the BIOS states max voltage is 1.42V, then even setting 1.6V manually will still only use 1.42V as the VRM's aren't capable of being told to use any more.

    Around the 1.4V mark is completely safe for a 4870, especially on water. Some have hard modded their cards to use 1.5V + when on water (with a full coverage block cooling VRMs too). They've gotten some nice clocks out of it too, 900MHz +

    Below is a shot of RBE. You can see where I've edited my BIOS to give the max voltage possible. Originally, it was one step down from max. This small increase saw my max GPU clock go from ~640MHz to ~720MHz (735MHz in most games except Crysis and Bioshock which crash it). I also extended the Overdrive OC limit to 800 core and 1300 RAM from 700/1100, to allow me to push the card further without loading yet another background process.

    Flashing is nice and easy, and if something does go wrong, you can flash back to the original BIOS or repeat the flash. Either do it blind or use another GPU in the second slot. To blind flash, note down the exact keystrokes needed to boot from the media containing the flashing prog and BIOS's, and the exact thing you have to type to flash, plus keystrokes to confirm flashing etc, basically any and every button you have to press.

    As you'll be flashing to a modded version of your own compatible BIOS, the only problem you'll encounter is if the AC power goes off during the flash. Other than thet, the BIOS will 100% work as it's only slightly modified. The checksum may be different though as it's modded, so using the command switch to force the flash may be required.

    If you don't have a full coverahe block with the VRM's being cooled, I strongly recommend sinking them with some copper heatsinks and running a fan over them. For me, the VRM's get very toasty. Their limit is 115c I believe, but somewhere under 80c is a much nicer place to be IMO. They cool down dramatically with even just a fan on them. Be careful, as they litterelly get so hot that they'll burn you. I have short nails and actually burnt the skin on my finger tip by touching them when uncooled. It hurt for days after.


    EDIT! You do have a full coverage block, I didn't know the picture could be scrolled. Depending on the model, you may have some more VRM's around the back (minus the chokes). These may need cooling actively with heatsinks too. VRM temps getting too high can lead to ATI driver errors, GPU recovery (where the screen goes black and the display driver restarts) and when the thermal limit is reached it will restart the PC.
    Last edited by Psycho101; 08-18-2009 at 07:44 AM.
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  2. #22
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    Default Re: E5200 + GA-EP45-DS3P Overclock help

    Here are my current temps

    There are no VRM's on the back of the card and they are currently being cooling by the full block. I'll check the bios details now.

    Cosair TX 650W PSU
    OCZ Gold 800Mhz 2x2GB 5-5-5-18 @2.1v
    ATi 4870 XFX 512MB
    GigaByte GA-EP45-DS3P

  3. #23
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    Default Re: E5200 + GA-EP45-DS3P Overclock help

    That's excellent. The only factor it could be then is indeed GPU voltage.

    You will see several entries in RBE with clocks and voltages. Usually clock entry no.9 is the one to change. If you want to be 100% sure you have the max supported voltage set, change all the clock entries with the max card clocks in them to the max voltage.

    It surprised me how such a tiny voltage increase gave me such a huge OC. Your voltage options will definitely be different, much higher. After all, the 4850 contains the exact same GPU as the 4870 (ATI admits they've not speed binned them either) it's just that the 4870 has twice the VRM's in parallel and a much more sophisticated VRM controller. This allows more voltage to be used and the load to be spread over twice as many VRM's, hence one reason why it's more expensive than the 4850 (another being twice the RAM bandwidth ofc).
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  4. #24
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    Default Re: E5200 + GA-EP45-DS3P Overclock help

    see what you make of this, here are my current settings

    Cosair TX 650W PSU
    OCZ Gold 800Mhz 2x2GB 5-5-5-18 @2.1v
    ATi 4870 XFX 512MB
    GigaByte GA-EP45-DS3P

  5. #25
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    Default Re: E5200 + GA-EP45-DS3P Overclock help

    it definitely seems like they've set the bare minimum voltage to run stock speeds. The crafty buggers!

    As you can see, fortunately you are able to program the voltage registers yourself to edit the voltage table and set a custom amount. I suggest looking up a guide on the exact correct procedure. I am not 100% familiar with doing so as my VRM's can't be re-programmed. If re-programing, I'd start with 1.32V and see where it will take you. Up to 1.4V will be more than fine, but as always use the minimum to stay stable at the clockspeed you'd like. 850Mhz is a realistic oal, and if you go for a ~1.4V GPU Vcore thn 900+ is attainable.

    Let me know how you get on and what you did. I'd be interested to learn more about the programable VRM's and the editing method (it's definitely possible and it's the method of choice).
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    2 x 2GB Mushkin Ridgeback (996902), @ 7-10-8-27, 2010-DDR, 1.66v
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  6. #26
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    Default Re: E5200 + GA-EP45-DS3P Overclock help

    You guys need a guide on that tool? Here is one just in case
    http://www.techpowerup.com/articles/...ng/vidcard/154

    You can also read around a bit in the forum section for this tool and or ask any questions you need to here >>
    RBE - techPowerUp! Forums

    May find some help here as well as noted within the tool's menus
    Tutorial: How to softmod to ANY VGPU you want without hardmods! (1.3~1.6v or more) - XtremeSystems Forums

  7. #27
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    Default Re: E5200 + GA-EP45-DS3P Overclock help

    Okay! I have been looking into this problem and it seems to mainly be with XFX 4870 Bios and CCC switching from 2D core/mem/voltage and 3D core/mem/voltage.


    I've edited the bios and flashed the core it to 1.265 V and taken off the power saving options having the Voltage and Core/mem speeds consistant.
    I have started with a small but successful overclock and I'll but updating the thread with my highest overclock at this volt. Currently I am happy I can achieve any overclock, I wouldn't recommend XFX ATi combo for the time being.

    Cosair TX 650W PSU
    OCZ Gold 800Mhz 2x2GB 5-5-5-18 @2.1v
    ATi 4870 XFX 512MB
    GigaByte GA-EP45-DS3P

  8. #28
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    Default Re: E5200 + GA-EP45-DS3P Overclock help

    I concur with your recommendation. For a highly overclockable ATI card I'd go with either the Saphire Toxic 4890 if not watercooling as their cooler is superb and the card will go to 1GHz core, or the ASUS card with built in volt altering features. Again, with the ASUS card you can get 1GHz+ on the core and you can also alter RAM volts a little to get maybe 4400MHz to 4600MHz, which is great for boosting high res gaming with alot of stuff to anti alias an with ultra quality textures being thrown around.

    Hopefully your 4870 will do about 850 on the core with that voltage. That seems to be around the right amount on average (I researched both the 4870 and 4850 really heavily before I bought the 4850). With altering the volt table you should get a max of about 900-925MHz. After that the 4870's tend to crap out no matter the voltage and cooling. this is due to power leakage, or so most believe. The 4890 GPU is actually almost identical except for a ring of transistors on the outer edge of the die to lessen the power leakage/interference problem.

    Let us know how you get on.

    @Lsdmeasap, thanks I'll read those links. I'm unsure atm how I can get my card over the addressed volt limit without volt modding as I believe it's just not possible. Maybe, hopefully, the article will tell me different or show me something I missed. It's also difficult with a hardware mod as the 4850 has just a single 6 pin PCIe connector, and really requires two at higher voltages, like it's 4870 big brother.
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    2 x 2GB Mushkin Ridgeback (996902), @ 7-10-8-27, 2010-DDR, 1.66v
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  9. #29
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    Default Re: E5200 + GA-EP45-DS3P Overclock help

    ok I'm at

    800Mhz - Core
    1000Mhz - Memory

    Ran a few loops on the Crysis benchmark to test the card temps - no artifacts yet.


    "Completed All Tests

    <><><><><><><><><><><><><>>--SUMMARY--<<><><><><><><><><><><><><>

    16/08/2009 21:35:19 - Vista 64

    Run #1- DX10 1680x1050 AA=No AA, 64 bit test, Quality: VeryHigh ~~ Overall Average FPS: 27.1"

    what would be pushing it on the VRC temps

    Cosair TX 650W PSU
    OCZ Gold 800Mhz 2x2GB 5-5-5-18 @2.1v
    ATi 4870 XFX 512MB
    GigaByte GA-EP45-DS3P

  10. #30
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    Default Re: E5200 + GA-EP45-DS3P Overclock help

    I'd say that pushing it on VRM's would be at around 95c IMO. They should do under that all day every day just fine. 115-120 is the rating for the 4850's VRM's but I'm not sure of the 4870's. It may be higher or the same.

    It's worth noting that despite the water cooling, a good 5-10c can also be shaved off these temps with a 120mm fan on quite low revs blowing on the back of the card. Although alot of heat is obviously taken care of by the water block, it's surprising how much the back of components heat up and also heat the PCB. The PCB can be used to your advantage, like a giant card sized heatsink with a little breeze blowing on/over it.

    If temps stay in that 72c range though, I wouldn't bother with a fan. those temps are very good. Unfortunately my VRM's don't have temp sensors in them so I can't post a picture for comparison.

    Edit: FurMark is definitely also a great tool for testing purposes. I know that real world gaming is an excellent test, but FurMark will simulate in 10-15 minutes the kind of heat that builds up after 3-4 hours of gaming. Any artefacts that show will be really easy to spot using it and you can take steps to eliminate them before you get a possible game crash or even just a cosmetic annoyance. As temps are so good, any artefacts would 100% be a case of lowering clocks by 5MHz and re-testing, or if possible increasing voltage (you have plenty of room until 1.38-1.4V).
    Last edited by Psycho101; 08-19-2009 at 05:07 AM.
    Coolermaster CM 690 II advance Case
    Corsair HX750 (CWT, 91%(80+ Gold rated @230V) single 62A 12V rail
    P55A-UD4 v2.0 @ F14
    Core i5 760 @ 20 x 201, 4.02GHz
    TRUE Black with a single Noctua NF-P12 pumping out 55 CFM @ 19db .
    2 x 2GB Mushkin Ridgeback (996902), @ 7-10-8-27, 2010-DDR, 1.66v
    2 x Gigabyte GTX 460 1024MB in SLI (Pre OC'd to 715MHz core and 1800MHz VRAM) @ 850 Core / 4100 Mem.
    Intel X25-M Boot Drive (OS and Programs) 200MB/s Read & 90MB/s Write
    Corsair X32 200MB/s Read & 100MB/s Write
    WD Caviar Blue 640GB C (Steam, Games, Storage, Temp Files & Folders, etc)
    Samsung F3 500GB Backup/Images
    Noctua 1300RPM 19dB case fan (rear extraction)
    3 x 140 MM Coolermaster LED fans (one front intake, one top extraction, one side intake)
    Dell Ultra Sharp 2209WAf E-IPS @ 1680x1050

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