HM70 chipset: complete guide to supported laptop processors (4th and 5th generation Intel)

Chipset Intel HM70 - this is a bridge between the processor and the rest of the laptop components, determining which CPU can be installed on your system. If you are planning to upgrade an old laptop based on Haswell (4th generation) or Broadwell (5th generation), then it depends on the HM70 whether you can install a more powerful processor or stay with the current one. In this article we will analyze not only the official list of compatible processors for HM70, but also nuances that laptop manufacturers often keep silent: from TDP limitations to problems with the BIOS.

Why is this important? The fact is that even if the processor physically fits the socket rPGA946B (for 4th generation) or BGA1168 (for the 5th), the HM70 chipset may block its operation due to limitations in power supply, technology support (vPro, VT-x) or even the microcode version in the BIOS. We've collected up-to-date data for 2026, including rare cases where HM70 laptops are running processors not listed in Intel's official specifications.

What is the HM70 chipset and why is it important for an upgrade?

Chipset HM70 belongs to the series Intel 8 Series (codename Lynx Point) and was introduced along with the processors Haswell in 2013. Its main task is to manage the interaction between the CPU, RAM (DDR3L up to 1600 MHz), drives (SATA 6 Gb/s) and peripheral devices. Unlike desktop chipsets (for example, H87 or Z87), HM70 is optimized for mobile platforms where energy efficiency and compactness are critical.

The key feature of the HM70 is support built-in graphics core Intel processors (HD Graphics 4400/4600/5000/Iris Pro). This means that even if your laptop does not have a discrete graphics card, the chipset will provide integrated graphics. However, here lies the first pitfall: some processors with powerful GPUs (for example, Core i7-4950HQ with Iris Pro 5200) may require additional power, which the HM70 is not always able to provide.

• 🔧 Socket: rPGA946B (4th generation) or BGA1168 (5th generation, soldering).
• ⚡ TDP: officially up to 47 W, but some laptops support up to 57 W (depending on the cooling system).
• 🖥️ Memory: up to 32 GB DDR3L 1333/1600 MHz (depending on processor).
• 🔌 Interfaces: up to 6 ports USB 3.0, 4 lines PCIe 2.0.

It is important to understand that the HM70 is not the most advanced chipset in the Intel 8 Series line. For example, HM86/HM87 support more PCIe lanes and have improved power management. This means that even if the processor is physically compatible with the HM70, it may not run at full capacity due to chipset limitations.

Official list of supported processors for HM70

Intel in its documentation indicates that the HM70 chipset is compatible with all 4th (Haswell) and 5th (Broadwell) generations, but with reservations. Below is a table with the main models that are guaranteed to work on most HM70 laptops. Please note: some manufacturers (eg. Dell or HP) can artificially limit the list of supported CPUs through the BIOS.

Family	Processor model	TDP (W)	Graphics	Notes
Core i3 (4th)	i3-4000M, i3-4010U	37 / 15	HD 4400	Suitable for office laptops
Core i5 (4th)	i5-4200M, i5-4300U	37 / 15	HD 4600	Optimal price/performance balance
Core i7 (4th)	i7-4700MQ, i7-4800MQ	47	HD 4600	Requires good cooling
Core i7 (5th)	i7-5500U, i7-5600U	15	HD 5500	Only for laptops with soldered joint (BGA)
Xeon (mobile)	E3-1275 v3, E3-1285 v3	47	HD P4700	ECC memory support, rare in laptops

The series processors deserve special attention Broadwell-U (5th generation, for example, i5-5200U). They have soldering BGA1168, which means it is impossible to replace without re-soldering. If your laptop originally came with the 4th generation (Haswell), then install Broadwell It won't work - even if the HM70 chipset theoretically supports both generations.

⚠️ Attention: Processors with index HQ (For example, i7-4720HQ) have a TDP of 47 W and require a powerful cooling system. Installing such a CPU in a thin laptop with HM70 can lead to overheating and throttling after just 5-10 minutes of load.

How to check HM70 CPU compatibility in your laptop

Even if a processor is on the official compatibility list, this does not guarantee that it will work in your particular laptop. Manufacturers often modify power plans and BIOS, limiting support for certain models. Here is a step-by-step verification algorithm:

1. Find out your current chipset and processor model.

   Use utilities like CPU-Z (tab Mainboard) or HWiNFO. Pay attention to the BIOS revision - the old version may not support new processors even within the same generation.

2. Check the socket and solder type.

   If in CPU-Z specified BGA1168, then the processor is soldered and cannot be replaced. If rPGA946B — an upgrade is possible, but TDP must be taken into account.

3. Check out the list of supported CPUs for your laptop model.

   On manufacturers' websites (for example, Lenovo or Asus) there are often sections with compatibility information. For example, a laptop Lenovo ThinkPad T440p with HM70 officially supports up to i7-4900MQ, but not all BIOS revisions allow this.

If there is no information from the manufacturer, you can use the database NotebookCheck, where users share their upgrade experiences. For example, in HP EliteBook 840 G1 some installed successfully i7-4810MQ instead of standard i5-4300M, but only after updating the BIOS to version 1.40.

Make sure the socket matches (rPGA946B or BGA1168)

Check the TDP of the new CPU (should not exceed the current one by more than 10 W)

Find reviews about compatibility of your particular laptop model

Update BIOS to the latest version (if possible)

Prepare thermal paste and cooler (for processors with TDP > 37 W) -->

Upgrade subtleties: what could go wrong

Even if you have selected the processor in all respects, unexpected problems may arise during the upgrade. Here are the most common of them:

• 🔥 Overheat: Laptops with the HM70 often have weak cooling systems designed for base processors. Installation i7-4940MX (57 W) instead i5-4200M (37 W) can lead to constant throttling.
• ⚡ Lack of nutrition: The HM70 chipset is not always able to provide stable power for processors with high power consumption. Symptoms: Random shutdowns under load.
• 🖥️ BIOS incompatibility: Some laptops (eg. Dell Latitude E6440) have "white lists" of processors in the BIOS. If your model is not there, the system will not start.
• 🔌 Problems with integrated graphics: Processors with Iris Pro (For example, i7-4950HQ) may require additional drivers that do not always work correctly on the HM70.

You need to be especially careful with series processors Xeon. Although they are socket compatible with the HM70, many laptops do not support ECC memory, which is required for full operation of Xeon. As a result, you may end up with a system that is unstable or won't start at all.

⚠️ Attention: If after replacing the processor the laptop turns on, but the screen remains black, this may mean that the BIOS does not support the new kernel. In some cases, resetting the CMOS helps (remove the battery for 10 minutes), but more often it requires flashing a modified BIOS.

What to do if the laptop does not turn on after replacing the CPU?

1. **Check the installation of the processor** - it should sit in the socket without distortion. For rPGA946B, make sure all pins are in place.

2. **Reset BIOS** - remove the CMOS battery for 10-15 minutes or use a jumper CLR_CMOS (if any).

3. **Try the old processor** - if the laptop works, the problem is the compatibility of the new CPU.

4. **Update the BIOS** - if possible, flash the latest version through the programmer (for example, CH341A).

5. **Check Power** - Some laptops require a larger power supply for processors with a TDP > 45W.

Best processors for upgrading laptops from HM70

If your goal is maximum performance within the HM70 chipset, then the following processors are the best options:

• 🚀 For office tasks: Core i5-4300M (2 cores / 4 threads, 37 W) - optimal balance between power consumption and performance. Suitable for Lenovo ThinkPad T440, HP EliteBook 840 G1.
• 🎮 For light gaming: Core i7-4810MQ (4 cores / 8 threads, 47 W) - best choice for laptops with discrete graphics (e.g. NVIDIA GT 740M). Paired with HM70 shows an increase of up to 30% compared to i5-4200M.
• 💼 For workstations: Xeon E3-1285 v3 (4 cores / 8 threads, 47 W) - supports ECC memory and has powerful graphics HD P4700. Ideal for Dell Precision M4800, but requires checking BIOS compatibility.

For laptops with soldering (BGA1168) selection is limited to the 5th generation (Broadwell). The best option here would be Core i7-5600U (2 cores / 4 threads, 15 W) - it provides a 10-15% performance increase compared to i5-5200U with the same energy consumption.

If you are looking for a processor for a specific laptop model, we recommend using the service CPU-Upgrade, where a database of brand compatibility is collected. For example, for Asus N550JV with HM70 the maximum supported processor is i7-4700MQ, although theoretically the chipset should work with i7-4940MX.

How to update BIOS to support new processor

One of the main reasons why a new processor does not work with the HM70 is an outdated BIOS version. Laptop manufacturers often limit CPU support in older firmware, especially when it comes to budget models. Here's how to update the BIOS correctly:

1. Download the latest BIOS from the manufacturer's website.

   For example, for Lenovo ThinkPad T440p current version for 2026 - 2.50. Make sure the firmware is specific to your model (check the serial number).

2. Create a bootable USB flash drive.

   Use the utility Rufus to create a bootable USB flash drive in the format FAT32. Copy the BIOS file to it (usually has the extension .exe or .fd).

3. Update the BIOS in DOS mode.

   Reboot your laptop, enter the Boot Menu (usually F12) and select boot from flash drive. At the command prompt, enter the BIOS file name (for example, flash.bat) and follow the instructions.

If updating via DOS is not possible, you can use the manufacturer's utilities for Windows (for example, Lenovo System Update or HP Support Assistant). However, this method is less reliable, as the BIOS may be damaged if there is a power failure.

⚠️ Attention: Some laptops (eg. Acer Aspire V3-572G) have protection against BIOS downgrade. If you flash the old version over the new one, the laptop may not turn on. Always check the current BIOS version before updating.

Frequent errors when upgrading a processor to HM70

Even experienced users sometimes make mistakes when replacing the processor in laptops with the HM70 chipset. Here are the most common ones:

• 🔌 Ignore TDP: Installing a processor with a TDP of 57 W (for example, i7-4940MX) into a laptop rated for 37 W leads to overheating and automatic frequency reduction. Check the maximum TDP for your model on the manufacturer's website.
• 🔧 Incorrect cooler installation: After replacing the processor, you need to clean off the old thermal paste and apply new one. Using old paste or a loose cooler seal can cause overheating after just a few minutes of operation.
• 🖥️ BIOS incompatibility: Some laptops (eg. Sony VAIO SVS1511) have hard-wired restrictions on processor models. Even if the HM70 chipset supports the CPU, the BIOS may block it.
• 💾 Lack of drivers: After replacing the processor, you may need to reinstall the chipset and graphics drivers. This is especially true for processors with Iris Pro, which require special drivers from Intel.

Another typical mistake is buying a processor with soldering (BGA1168) for a laptop with a replaceable socket (rPGA946B). For example, Core i7-5500U (5th generation) is not physically suitable for a 4th generation laptop, even if the HM70 chipset theoretically supports both families.

If after an upgrade your laptop is running slower than before, check the following points:

• Make sure that the BIOS mode is enabled AHCI for the drive (not IDE).
• Check that Windows power settings are set to Maximum performance.
• Update your chipset and graphics drivers from the official Intel website rather than through Windows Update.

FAQ: Answers to frequently asked questions about HM70 and processors

Is it possible to install a 6th generation processor (Skylake) in a laptop with HM70?

No, the HM70 chipset does not support processors Skylake (6th generation) and newer. The maximum is the 5th generation (Broadwell), and then only in laptops with soldering BGA1168. For Skylake series chipset required 100 Series (For example, HM170).

What is the maximum processor that can be installed in a laptop with HM70 and socket rPGA946B?

Theoretically the most powerful processor for rPGA946B - this is Core i7-4940MX (4 cores / 8 threads, 57 W). However, in practice it will not work on all laptops due to power and cooling limitations. A more reliable option is i7-4910MQ (47 W).

Will Xeon work in a laptop with HM70?

Yes, mobile processors Xeon E3-12xx v3 (For example, E3-1285 v3) are compatible with HM70 via socket, but there are some nuances:

• Need support ECC memory from the laptop side (rare).
• Some Xeon features (such as vPro) can be disabled at the BIOS level.
• Xeons typically have a higher TDP (47W), which can cause overheating in thin laptops.

Do I need to update the BIOS before replacing the processor?

Preferable, but not always required. If the new processor is already in the list of those supported by your BIOS version, then an update is not required. However, if you are installing a newer model (for example, i7-4930MX instead of i5-4300M), then updating the BIOS may be critical. Before updating the firmware, be sure to check whether the new version supports your current processor (in case of a downgrade).

Is it possible to overclock a processor based on the HM70 chipset?

No, the HM70 chipset does not support overclocking (changing the multiplier or voltage). The maximum that can be done is to enable the mode in the BIOS Turbo Boost (if disabled) or optimize cooling to reduce throttling. Overclocking requires series chipsets Z (For example, Z87 or Z97), which are not used in laptops.