Dell Optiplex 755 mini tower CPU and Gpu upgrade
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DallasFlier
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- Jan 10, 2015
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You can definitely upgrade the CPU to the one you're wanting to use, but you should replace the heatsink/shroud with the copper core model when you do so. The heatsink/shroud you need is the HEATSINK D9729 SHROUD J9761. I was able to find a new one on eBay for $15.
EDIT: Doublecheck the CPU. Get the tech spec for your model - I put that CPU into my Optiplex 780 and it works fine, but please confirm for your 755.
FURTHER UPDATE: The tech spec for your model here says that the top processor you can put in would be the Core 2 Quad Q6700.
As for the graphics card, not sure specifically about 2GB, but you have two constraints in terms of graphics card. You can't use one which has a two slot backplate, and your power supply won't handle one which requires an additional power connector. I recommend finding a single-slot HD 7750 which will provide a considerable upgrade in performance - I put in a 1GB DDR5 HD 7750 card, which will handle your gaming needs just fine, and is likely better than a 2GB DDR3 card anyway.
EDIT: Doublecheck the CPU. Get the tech spec for your model - I put that CPU into my Optiplex 780 and it works fine, but please confirm for your 755.
FURTHER UPDATE: The tech spec for your model here says that the top processor you can put in would be the Core 2 Quad Q6700.
As for the graphics card, not sure specifically about 2GB, but you have two constraints in terms of graphics card. You can't use one which has a two slot backplate, and your power supply won't handle one which requires an additional power connector. I recommend finding a single-slot HD 7750 which will provide a considerable upgrade in performance - I put in a 1GB DDR5 HD 7750 card, which will handle your gaming needs just fine, and is likely better than a 2GB DDR3 card anyway.
I agree as far as the GPU as I am running the ASUS 1GB GDDR5 HD 7750 Top GPU and Q9650 C2Q CPU in a Dell Optiplex 755 MT. There's a capacitor on the 755's mother board at the end of the 16x PCIe rail that gets in the way of many GPU's (the ASUS HD 7750 will fit around it while other brand 7750's won't). Secondly it only needs one bay but does take the space of 2. It was quite a wrestle/struggle to get it into the slot. I did ave to remove the heatsink's plastic cover and cut a notch into it to accomodate the GPU (do replace heatsink with the Copper Core model). As far as CPU upgrade I went for the Q9650 (You Must upgrade your Bios to A22 before you change your CPU). The Q9650 is larger at 3.0GHz and has a higher FSB at 1333 as well as more L2 Cache at 12MB. I also added an inTel 240GB SSD, a Startech PCIe 3.0 USB, and a Creative Sound Blaster 5.1 USB sound card. This all runs into a Samsung 51"Plasma TV and an Onkyo 3D Theatre System. Add a Logitech G27 Racing Wheel and you've got quite a system.
Tallon Serkanic
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- Jun 25, 2015
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I've read that if you aren't overclocking the original heatsink will do fine (not that the other heatsink is for overclocking). I just happened to have an extra heatsink with the copper tubing from a Dell 745MT and thought it would work much better than just a passive aluminum block. I was looking online and you can find a J9761 for under $20.00. I did have to cut a notch out of the plastic shroud to accomodate the ASUS HD 7750 1GB GDDR5 Top V2.
Tallon Serkanic
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- Jun 25, 2015
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You can upgrade to that cpu without having to upgrade the heatsink. Dell says that the q6700 is the max because the manual was old and made at the time of the Cpu's release. the maximum supported Cpu is a q9650.
Yes the Q9650 will work as I'm running it in my 755 Dell Optiplex MT but you do have to make sure your Bios is updated to A22. You should be able to use the heatsink you have now. I just used the type with copper tubing as I had it just laying around. I've been pricing C2Q processors and for some reason the Q9550 is so much cheaper in price. I see Q9650 CPU's for $115 while Q9550 CPU's go for $65. And you are right if you refer to Dell specs they will tell you the Q6700 is the max.
Metso
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- Aug 6, 2015
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Hi, you can go E8500 (65W) or E8600 (65W) Core 2 Duo . Dual core is a much cheaper than Q9650 (90W) and it may have faster single core performance. (E8500 $14, E8600 $21, Q9650 $92 in AliExpress). I would seriously consider E8500.
Remember that Xeon 5xxx variants do not work because of the Intel Q35 chipset in Optiplex 755, even if they are sold as compatible CPUs. The problem is dual cpu capability. 755 does not take dual cpu ready Xeons. Properly modified LGA771 or LGA775 single processor 3xxx series CPUs may work. For example, a X3363 (80W) LGA771 quad core Xeon with LGA771 to LGA775 adapter is reported to work (cpu-z validator, id: 3172436).
However, LGA 771 5xxx Xeon CPUs work for some other chipsets and they are available in cut and welded versions requiring no longer modifying the system board. They are a lot cheaper than Pentium versions, so it is really a shame that they don't work in Dell Optiplex 755.
L3360 is a quad core wit 65W power consumption, one for sale for $90/eBay. The best likely compatible quad core I can find would be Xeon X3380. It is the best LGA 775 CPU with 3.16GHz/12M. The price difference I have seen between single X3380 ($160) and E8500 would almost feed me for a month. They can still be found for a more reasonable price in lots of 10 CPUs.
Some sources also say that upgrading to Optiplex 745 copper CPU cooler is a good idea if upgrading to quad core, the others say it is not required. Check the power requrements of the CPU compared to the old CPU. As Toadknick said, remember the Bios update before upgrading the CPU.
Someone is selling Nvidia GT 610 2GB model in eBay for Dell 755 so it may work for you too. It is also possible to upgrade the power supply. There are no connector for extra power cable for GPU, but there are adapters for SATA power cable connector. If you go that route be sure to buy adapter meant for powering GPU from Sata power connector, not an adapter for powering Sata drive from Molex connector. See Terry Kennedy's Dell Optiplex 755 Upgrade Project discussion for details.
You might also consider upgrading memory. Optiplex 755 can take 16GB as 4GB modules. I have no idea if larger modules do work. If someone has spare PC2 8GB modules to test it, I would like to know if they work
Remember that Xeon 5xxx variants do not work because of the Intel Q35 chipset in Optiplex 755, even if they are sold as compatible CPUs. The problem is dual cpu capability. 755 does not take dual cpu ready Xeons. Properly modified LGA771 or LGA775 single processor 3xxx series CPUs may work. For example, a X3363 (80W) LGA771 quad core Xeon with LGA771 to LGA775 adapter is reported to work (cpu-z validator, id: 3172436).
However, LGA 771 5xxx Xeon CPUs work for some other chipsets and they are available in cut and welded versions requiring no longer modifying the system board. They are a lot cheaper than Pentium versions, so it is really a shame that they don't work in Dell Optiplex 755.
L3360 is a quad core wit 65W power consumption, one for sale for $90/eBay. The best likely compatible quad core I can find would be Xeon X3380. It is the best LGA 775 CPU with 3.16GHz/12M. The price difference I have seen between single X3380 ($160) and E8500 would almost feed me for a month. They can still be found for a more reasonable price in lots of 10 CPUs.
Some sources also say that upgrading to Optiplex 745 copper CPU cooler is a good idea if upgrading to quad core, the others say it is not required. Check the power requrements of the CPU compared to the old CPU. As Toadknick said, remember the Bios update before upgrading the CPU.
Someone is selling Nvidia GT 610 2GB model in eBay for Dell 755 so it may work for you too. It is also possible to upgrade the power supply. There are no connector for extra power cable for GPU, but there are adapters for SATA power cable connector. If you go that route be sure to buy adapter meant for powering GPU from Sata power connector, not an adapter for powering Sata drive from Molex connector. See Terry Kennedy's Dell Optiplex 755 Upgrade Project discussion for details.
You might also consider upgrading memory. Optiplex 755 can take 16GB as 4GB modules. I have no idea if larger modules do work. If someone has spare PC2 8GB modules to test it, I would like to know if they work
Metso :
Hi, you can go E8500 (65W) or E8600 (65W) Core 2 Duo . Dual core is a much cheaper than Q9650 (90W) and it may have faster single core performance. (E8500 $14, E8600 $21, Q9650 $92 in AliExpress). I would seriously consider E8500.
Remember that Xeon 5xxx variants do not work because of the Intel Q35 chipset in Optiplex 755, even if they are sold as compatible CPUs. The problem is dual cpu capability. 755 does not take dual cpu ready Xeons. Properly modified LGA771 or LGA775 single processor 3xxx series CPUs may work. For example, a X3363 (80W) LGA771 quad core Xeon with LGA771 to LGA775 adapter is reported to work (cpu-z validator, id: 3172436).
However, LGA 771 5xxx Xeon CPUs work for some other chipsets and they are available in cut and welded versions requiring no longer modifying the system board. They are a lot cheaper than Pentium versions, so it is really a shame that they don't work in Dell Optiplex 755.
L3360 is a quad core wit 65W power consumption, one for sale for $90/eBay. The best likely compatible quad core I can find would be Xeon X3380. It is the best LGA 775 CPU with 3.16GHz/12M. The price difference I have seen between single X3380 ($160) and E8500 would almost feed me for a month. They can still be found for a more reasonable price in lots of 10 CPUs.
Some sources also say that upgrading to Optiplex 745 copper CPU cooler is a good idea if upgrading to quad core, the others say it is not required. Check the power requrements of the CPU compared to the old CPU. As Toadknick said, remember the Bios update before upgrading the CPU.
Someone is selling Nvidia GT 610 2GB model in eBay for Dell 755 so it may work for you too. It is also possible to upgrade the power supply. There are no connector for extra power cable for GPU, but there are adapters for SATA power cable connector. If you go that route be sure to buy adapter meant for powering GPU from Sata power connector, not an adapter for powering Sata drive from Molex connector. See Terry Kennedy's Dell Optiplex 755 Upgrade Project discussion for details.
You might also consider upgrading memory. Optiplex 755 can take 16GB as 4GB modules. I have no idea if larger modules do work. If someone has spare PC2 8GB modules to test it, I would like to know if they work
Remember that Xeon 5xxx variants do not work because of the Intel Q35 chipset in Optiplex 755, even if they are sold as compatible CPUs. The problem is dual cpu capability. 755 does not take dual cpu ready Xeons. Properly modified LGA771 or LGA775 single processor 3xxx series CPUs may work. For example, a X3363 (80W) LGA771 quad core Xeon with LGA771 to LGA775 adapter is reported to work (cpu-z validator, id: 3172436).
However, LGA 771 5xxx Xeon CPUs work for some other chipsets and they are available in cut and welded versions requiring no longer modifying the system board. They are a lot cheaper than Pentium versions, so it is really a shame that they don't work in Dell Optiplex 755.
L3360 is a quad core wit 65W power consumption, one for sale for $90/eBay. The best likely compatible quad core I can find would be Xeon X3380. It is the best LGA 775 CPU with 3.16GHz/12M. The price difference I have seen between single X3380 ($160) and E8500 would almost feed me for a month. They can still be found for a more reasonable price in lots of 10 CPUs.
Some sources also say that upgrading to Optiplex 745 copper CPU cooler is a good idea if upgrading to quad core, the others say it is not required. Check the power requrements of the CPU compared to the old CPU. As Toadknick said, remember the Bios update before upgrading the CPU.
Someone is selling Nvidia GT 610 2GB model in eBay for Dell 755 so it may work for you too. It is also possible to upgrade the power supply. There are no connector for extra power cable for GPU, but there are adapters for SATA power cable connector. If you go that route be sure to buy adapter meant for powering GPU from Sata power connector, not an adapter for powering Sata drive from Molex connector. See Terry Kennedy's Dell Optiplex 755 Upgrade Project discussion for details.
You might also consider upgrading memory. Optiplex 755 can take 16GB as 4GB modules. I have no idea if larger modules do work. If someone has spare PC2 8GB modules to test it, I would like to know if they work
I don't know alot about ram or computers for that matter but I put 2 x 4GB Patriot PC2-6400 (800MHz) into my Dell 755 MT and it read 8GB Ram at 800MHz in the bios. I then added another 2 x 2GB Patriot PC2-6400 (800MHz) and checked the Bios. It read 12GB ram but the speed was reduced to 667MHz, what speed does your ram run at and does it make a difference, The reason I ask is because I read that if your ram speed is only 667MHz it's like you only have 6GB of Ram and the rest is wasted. I guess what I'm asking is that even if i got 16GB of ram to run at 800MHz doesn't that mean it's really only going to work as well as 8GB. Also can you tell me what is the fastest DDR2 this Dell will take. Sorry if these are trying questions but I do love this rig. I'm handicapped, on a pension and bought this 755 for $90. Every month for a year I bought parts for this rig. The Ram alone was $240.00 so I really don't want to put out another $240 for Ram if it isn't going to matter. Thanks for your help
Metso
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- Aug 6, 2015
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If the computer says your 800 MHz memory modules are running at 667 MHz, they probably do. Memory modules can run at lower speeds. It often happens when different speeds of memory modules (677 MHz and 800 MHz for example) are mixed.
There is a thread ( http://en.community.dell.com/support-forums/desktop/f/3514/t/18905211 ) in Dell support forum where Turing_Machine asks about Optiplex 775 memory running on 667 MHz instead of 800 MHz. KirkD suggested that it is because of different rank (1 for the first pair, 2 for the second pair). Rank of the memory modules can be read from bios, F2 in boot, System->Memory Info section if my memory serves me right. I'd check if the rank matches.
The 667 MHz vs. 800 MHz difference is discussed a lot. It means in peak data transfer rates 5333 MB/s vs 6400 MB/s. Because of CPU cache the perceived speed difference in task where speed of memory matters is smaller. See Tom's]http://www.tomshardware.com/reviews/ram-speed-tests,1807-8.html]Tom's Ultimate RAM Speed Tests, Benchmark Results[/url] ( http://www.tomshardware.com/reviews/ram-speed-tests,1807-8.html ) (April 9, 2008) and decide if the difference matters for you.
In this HardForum discussion (Would DDR2-533 RAM bottleneck a Q9550?, http://hardforum.com/showthread.php?t=1432895) savantu says, that Q9550 quad core runs just fine with 667 MHz memory. Even if your memory runs at 667MHz instead of 800 MHz, you can upgrade your CPU as high as Optiplex 775 MT can take. Dell equipped high end CPU Optiplex 755 models with 800 MHz memory, low end models with 667 MHz memory (Dell Optiplex 755 Technical Guide Book, https://www.dell.com/downloads/global/products/optix/en/opti_755_techspecs.pdf).
As far as I know, memory speed has no effect on usable memory size. More memory is in most cases better than less memory provided that your operating system can use the extra memory. The memory limitations of the most common Microsoft operating systems are listed here /https://msdn.microsoft.com/en-us/library/windows/desktop/aa366778%28v=vs.85%29.aspx).
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