diff --git a/share/man/man4/mfi.4 b/share/man/man4/mfi.4
index 14dab802fb16..a6d6278f1e64 100644
--- a/share/man/man4/mfi.4
+++ b/share/man/man4/mfi.4
@@ -72,6 +72,17 @@ If the sysctl
 .Va dev.mfi.%d.delete_busy_volumes
 is set to 1,
 then the driver will allow mounted volumes to be removed.
+.Pp
+A tunable is provided to adjust the
+.Nm
+driver's behaviour when attaching to a card.  By default the driver will
+attach to all known cards with high probe priority.  If the tunable
+.Va hw.mfi.mrsas_enable
+is set to 1,
+then the driver will reduce its probe priority to allow
+.Cd mrsas
+to attach to the card instead of
+.Nm .
 .Sh HARDWARE
 The
 .Nm
diff --git a/sys/dev/mfi/mfi_pci.c b/sys/dev/mfi/mfi_pci.c
index 8ff4ea7b54a7..6243677c6836 100644
--- a/sys/dev/mfi/mfi_pci.c
+++ b/sys/dev/mfi/mfi_pci.c
@@ -112,6 +112,11 @@ TUNABLE_INT("hw.mfi.msi", &mfi_msi);
 SYSCTL_INT(_hw_mfi, OID_AUTO, msi, CTLFLAG_RDTUN, &mfi_msi, 0,
     "Enable use of MSI interrupts");
 
+static int	mfi_mrsas_enable = 0;
+TUNABLE_INT("hw.mfi.mrsas_enable", &mfi_msi);
+SYSCTL_INT(_hw_mfi, OID_AUTO, mrsas_enable, CTLFLAG_RDTUN, &mfi_mrsas_enable,
+     0, "Allow mrasas to take newer cards");
+
 struct mfi_ident {
 	uint16_t	vendor;
 	uint16_t	device;
@@ -120,18 +125,18 @@ struct mfi_ident {
 	int		flags;
 	const char	*desc;
 } mfi_identifiers[] = {
-	{0x1000, 0x005b, 0x1028, 0x1f2d, MFI_FLAGS_SKINNY| MFI_FLAGS_TBOLT, "Dell PERC H810 Adapter"},
-	{0x1000, 0x005b, 0x1028, 0x1f30, MFI_FLAGS_SKINNY| MFI_FLAGS_TBOLT, "Dell PERC H710 Embedded"},
-	{0x1000, 0x005b, 0x1028, 0x1f31, MFI_FLAGS_SKINNY| MFI_FLAGS_TBOLT, "Dell PERC H710P Adapter"},
-	{0x1000, 0x005b, 0x1028, 0x1f33, MFI_FLAGS_SKINNY| MFI_FLAGS_TBOLT, "Dell PERC H710P Mini (blades)"},
-	{0x1000, 0x005b, 0x1028, 0x1f34, MFI_FLAGS_SKINNY| MFI_FLAGS_TBOLT, "Dell PERC H710P Mini (monolithics)"},
-	{0x1000, 0x005b, 0x1028, 0x1f35, MFI_FLAGS_SKINNY| MFI_FLAGS_TBOLT, "Dell PERC H710 Adapter"},
-	{0x1000, 0x005b, 0x1028, 0x1f37, MFI_FLAGS_SKINNY| MFI_FLAGS_TBOLT, "Dell PERC H710 Mini (blades)"},
-	{0x1000, 0x005b, 0x1028, 0x1f38, MFI_FLAGS_SKINNY| MFI_FLAGS_TBOLT, "Dell PERC H710 Mini (monolithics)"},
-	{0x1000, 0x005b, 0x8086, 0x9265, MFI_FLAGS_SKINNY| MFI_FLAGS_TBOLT, "Intel (R) RAID Controller RS25DB080"},
-	{0x1000, 0x005b, 0x8086, 0x9285, MFI_FLAGS_SKINNY| MFI_FLAGS_TBOLT, "Intel (R) RAID Controller RS25NB008"},
-	{0x1000, 0x005b, 0xffff, 0xffff, MFI_FLAGS_SKINNY| MFI_FLAGS_TBOLT, "ThunderBolt"},
-	{0x1000, 0x005d, 0xffff, 0xffff, MFI_FLAGS_SKINNY| MFI_FLAGS_TBOLT, "Invader"},
+	{0x1000, 0x005b, 0x1028, 0x1f2d, MFI_FLAGS_SKINNY| MFI_FLAGS_TBOLT| MFI_FLAGS_MRSAS, "Dell PERC H810 Adapter"},
+	{0x1000, 0x005b, 0x1028, 0x1f30, MFI_FLAGS_SKINNY| MFI_FLAGS_TBOLT| MFI_FLAGS_MRSAS, "Dell PERC H710 Embedded"},
+	{0x1000, 0x005b, 0x1028, 0x1f31, MFI_FLAGS_SKINNY| MFI_FLAGS_TBOLT| MFI_FLAGS_MRSAS, "Dell PERC H710P Adapter"},
+	{0x1000, 0x005b, 0x1028, 0x1f33, MFI_FLAGS_SKINNY| MFI_FLAGS_TBOLT| MFI_FLAGS_MRSAS, "Dell PERC H710P Mini (blades)"},
+	{0x1000, 0x005b, 0x1028, 0x1f34, MFI_FLAGS_SKINNY| MFI_FLAGS_TBOLT| MFI_FLAGS_MRSAS, "Dell PERC H710P Mini (monolithics)"},
+	{0x1000, 0x005b, 0x1028, 0x1f35, MFI_FLAGS_SKINNY| MFI_FLAGS_TBOLT| MFI_FLAGS_MRSAS, "Dell PERC H710 Adapter"},
+	{0x1000, 0x005b, 0x1028, 0x1f37, MFI_FLAGS_SKINNY| MFI_FLAGS_TBOLT| MFI_FLAGS_MRSAS, "Dell PERC H710 Mini (blades)"},
+	{0x1000, 0x005b, 0x1028, 0x1f38, MFI_FLAGS_SKINNY| MFI_FLAGS_TBOLT| MFI_FLAGS_MRSAS, "Dell PERC H710 Mini (monolithics)"},
+	{0x1000, 0x005b, 0x8086, 0x9265, MFI_FLAGS_SKINNY| MFI_FLAGS_TBOLT| MFI_FLAGS_MRSAS, "Intel (R) RAID Controller RS25DB080"},
+	{0x1000, 0x005b, 0x8086, 0x9285, MFI_FLAGS_SKINNY| MFI_FLAGS_TBOLT| MFI_FLAGS_MRSAS, "Intel (R) RAID Controller RS25NB008"},
+	{0x1000, 0x005b, 0xffff, 0xffff, MFI_FLAGS_SKINNY| MFI_FLAGS_TBOLT| MFI_FLAGS_MRSAS, "ThunderBolt"},
+	{0x1000, 0x005d, 0xffff, 0xffff, MFI_FLAGS_SKINNY| MFI_FLAGS_TBOLT| MFI_FLAGS_MRSAS, "Invader"},
 	{0x1000, 0x0060, 0x1028, 0xffff, MFI_FLAGS_1078,  "Dell PERC 6"},
 	{0x1000, 0x0060, 0xffff, 0xffff, MFI_FLAGS_1078,  "LSI MegaSAS 1078"},
 	{0x1000, 0x0071, 0xffff, 0xffff, MFI_FLAGS_SKINNY, "Drake Skinny"},
@@ -178,7 +183,13 @@ mfi_pci_probe(device_t dev)
 
 	if ((id = mfi_find_ident(dev)) != NULL) {
 		device_set_desc(dev, id->desc);
-		return (BUS_PROBE_DEFAULT);
+
+		/* give priority to mrsas if tunable set */
+		TUNABLE_INT_FETCH("hw.mfi.mrsas_enable", &mfi_mrsas_enable);
+		if ((id->flags & MFI_FLAGS_MRSAS) && mfi_mrsas_enable)
+			return (BUS_PROBE_LOW_PRIORITY);
+		else
+			return (BUS_PROBE_DEFAULT);
 	}
 	return (ENXIO);
 }
diff --git a/sys/dev/mfi/mfivar.h b/sys/dev/mfi/mfivar.h
index 664ede96ad78..7f75062cb61b 100644
--- a/sys/dev/mfi/mfivar.h
+++ b/sys/dev/mfi/mfivar.h
@@ -199,6 +199,7 @@ struct mfi_softc {
 #define MFI_FLAGS_GEN2		(1<<6)
 #define MFI_FLAGS_SKINNY	(1<<7)
 #define MFI_FLAGS_TBOLT		(1<<8)
+#define MFI_FLAGS_MRSAS		(1<<9)
 	// Start: LSIP200113393
 	bus_dma_tag_t			verbuf_h_dmat;
 	bus_dmamap_t			verbuf_h_dmamap;